TWI691628B - Mesh structure - Google Patents

Abstract

An object of the present invention is to provide a network structure having any thermoplasticity of a continuous linear body of a polyester-based thermoplastic elastomer and a continuous linear body of a polyolefin-based thermoplastic elastomer having a fiber diameter of 0.1 mm or more and 3.0 mm or less. A three-dimensional random ring joint structure composed of continuous linear bodies of elastomers. In the thickness direction of the network structure: the main area of the solid section fiber is mainly composed of the medium section fiber; the main section of the hollow section fiber is mainly composed of the hollow section fiber; and the mixed area is located between the two regions The solid section fiber and hollow section fiber are mixed. The residual strain on the side of the main area of the fiber of the solid section of the mesh structure and the residual strain on the side of the main area of the fiber of the hollow section are both less than 20%, and the residual strain on the side of the main section of the fiber of the solid section is mainly The difference in residual strain on the area side is 10 points or less.

Description

Mesh structure

The present invention relates to a mesh structure, which is suitable for office chairs, furniture, sofas, beds and other bedding, or train, car, two-wheeler, baby carriage, children's chair, wheelchair and other vehicle seats, or floor mats or anti-slip Mesh cushioning materials such as cushions for impact absorption such as collision or anti-pinch members.

Nowadays, the mesh structure is widely used as a cushioning material for furniture, bed and other bedding, trams, automobiles, two-wheelers and other vehicle seats. Japanese Patent Laid-Open No. 7-68061 (Patent Document 1) and Japanese Patent Laid-Open No. 2004-244740 (Patent Document 2) disclose a method for manufacturing a mesh structure. The network structure has the following advantages: Compared with the foamed-crosslinked urethane, it has the same degree of durability, excellent moisture permeability, water permeability, and air permeability, and is less susceptible to boredom because of its low heat storage. In addition, because it is made of thermoplastic resin, it is easy to recycle, and there is no need to worry about the residue of chemicals, so it has the advantage of being environmentally friendly. However, with some exceptions, these mesh structures do not have the concept of positive and negative, and the feeling of cushioning is the same no matter which side is used.

Although the mesh structure has unique cushioning properties, it is changed on its own It is more difficult to change its buffering performance. In response to this problem, Japanese Unexamined Patent Publication No. 7-189105 (Patent Document 3) discloses a mesh structure with different fineness and a method for manufacturing the same. This consists of a basic layer responsible for absorbing vibration and maintaining shape, and a soft surface layer with characteristics for dispersing pressure to make it uniform. As mentioned above, each layer is responsible for playing different roles for the purpose of improving the comfort when riding from the surface layer side, but it does not consider the use of riding from the surface layer side and the riding from the basic layer side from the two sides By way of comparison, the compression durability is lower when riding from the surface layer side than when riding from the base layer side, and the compression durability becomes different when riding from the surface layer side and when riding from the base layer side.

In addition, although there are cases where mesh structures of different designs are adhered and bonded, or tied together with a strap, or integrated outside, there are high production costs and the use of adhesives There is a problem that the feeling of the pad changes and there is a risk of feeling a foreign body, and the compression durability on both sides becomes very different.

[Prior Technical Literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 7-68061.

Patent Document 2: Japanese Patent Laid-Open No. 2004-244740.

Patent Document 3: Japanese Patent Laid-Open No. 7-189105.

The present invention was developed under the background of the above-mentioned prior art subject. The subject of the present invention is to provide a mesh structure that can impart different cushioning properties to both sides, and has compression regardless of which side of the two sides is pressurized. The effect of the difference in durability is small.

The present inventors have made intensive studies to solve the above-mentioned problems, and finally completed the present invention. That is, the present invention is as follows.

[1] A network structure having any one of a continuous linear body of a polyester-based thermoplastic elastomer and a continuous linear body of a polyolefin-based thermoplastic elastomer having a fiber diameter of 0.1 mm or more and 3.0 mm or less The three-dimensional random loop joint structure composed of continuous linear bodies exists in the thickness direction of the mesh structure: the main area of the solid section fiber is composed of the fiber with the main solid section; the main section of the hollow section fiber is composed of the main A fiber with a hollow cross-section; and a mixing area, which is a mixture of fibers with a solid cross-section and fibers with a hollow cross-section that are located between the main area of the solid cross-section fiber and the main area of the hollow cross-section fiber. Repeated compression of 750N constant load during compression of the main area of the fiber of the solid section of the mesh structure after repeated compression After compression, any of the residual strains on the main section side of the hollow section fiber is 20% or less. Residual strain and hollow on the main area side of the medium solid section fiber The difference in residual strain on the side of the main area of the cross-sectional fiber is 10 minutes or less. Here, the fiber diameter means the average fiber diameter of the complex measurement values described in the measurement method described later.

[2] The mesh structure according to the above [1], wherein the apparent density is 0.005 g/cm ³ or more and 0.20 g/cm ³ or less.

[3] The mesh structure as described in [1] or [2] above, wherein the fiber having a hollow cross-section has a thicker fiber diameter than the fiber having a solid cross-section and has a solid cross-section The difference in fiber diameter between the fiber and the fiber having a hollow cross-section is 0.07 mm or more. Here, the difference in fiber diameter means the difference between the average fiber diameter of a fiber having a solid cross section and the average fiber diameter of a fiber having a hollow cross section as described in the measurement method described below.

[4] The mesh structure according to any one of the above [1] to [3], wherein the hardness at 25% compression when pressurized from the side of the main section of the fiber of the solid section and the side of the main section of the fiber of the hollow section The ratio of the hardness at 25% compression when compressed is 1.03 or more.

[5] The mesh structure according to any one of the above [1] to [4], wherein the hardness at 40% compression when pressurized from the side of the main section of the fiber of the solid section and the side of the main section of the fiber of the hollow section The ratio of the hardness at 40% compression under compression is 1.05 or more.

[6] The mesh structure according to any one of the above [1] to [5], wherein the compressive deformation coefficient when pressurized from the main region side of the solid cross-section fiber and when pressurized from the main region side of the hollow cross-section fiber The difference of the compression deformation coefficient is 5 or less.

[7] The mesh structure according to any one of the above [1] to [6], wherein the hysteresis loss when pressurized from the main region side of the fiber of the solid cross section and the pressure loss from the main region side of the fiber of the hollow cross section The difference in hysteresis loss is 5 points or less.

[8] The reticulated structure according to any one of the above [1] to [7], wherein the continuous linear body of the thermoplastic elastomer is a continuous linear body of the polyester-based thermoplastic elastomer, from which the fiber is solid sectioned Both of the hysteresis loss when the main area side is pressurized and when the hollow section fiber main area side is pressurized is 30% or less.

[9] The network structure as described in any one of the above [1] to [7], wherein the continuous linear body of the thermoplastic elastomer is a continuous linear body of the polyolefin-based thermoplastic elastomer, from which the solid cross-section fiber Both of the hysteresis loss when the main area side is pressurized and when the hollow section fiber main area side is pressurized is 60% or less.

[10] A cushioning material, the interior of which includes the mesh structure described in any one of the above [1] to [9], and can be used in both directions.

The present invention can provide a net-shaped structure, which has different cushioning properties on the front and back sides, and has the effect of little difference in compression durability regardless of which side is pressed. Therefore, since both the front and back sides of the mesh structure can be used, it is possible to provide a mesh structure suitable for office chairs, furniture, sofas, bed and other bedding, vehicle seats such as trains, automobiles, and motorcycles. As an example of the effect of the cushioning material that can be used on both sides, in summer, the fiber side with a hollow cross-section with a thick fiber diameter is used on the surface, which has a harder feel and reduced The characteristic of feeling cool by the contact area; in winter, because the fiber side with a fine fiber diameter and a solid cross section is used on the surface, there is a softer feeling of cushioning and the characteristic of feeling warm by increasing the contact area .

In addition, when the net-like structure of the present invention uses the fiber side having a solid cross section with a fine fiber diameter as the surface, it is 100% more than a net composed of fibers with a medium cross section with a fine fiber diameter. The shaped structure has better compression durability. Therefore, even in the case where the fiber side having a solid cross section with a fine fiber diameter is used on the surface, it is superior to the conventional product in compression durability, so it can be used better.

FIG. 1A is a schematic diagram showing the second stress-strain curve in the hysteresis loss measurement of the mesh structure.

Figure 1B shows the second measurement of the hysteresis loss of the mesh structure Schematic diagram of the stress-strain curve during compression.

FIG. 1C is a schematic diagram showing the stress-strain curve at the second decompression in the hysteresis loss measurement of the mesh structure.

The present invention will be described in detail below. The present invention is a network structure, which is any one of a continuous linear body of a polyester-based thermoplastic elastomer having a fiber diameter of 0.1 mm or more and 3.0 mm or less and a continuous linear body of a polyolefin-based thermoplastic elastomer A three-dimensional random ring joint structure composed of a continuous linear body of thermoplastic elastomer. In the thickness direction of the net-like structure, there are: the main area of the medium-solid cross-section fiber, which is composed of fibers mainly having a medium-solid cross-section (hereinafter referred to as "medium-solid cross-section fiber"); the main area of the hollow-section fiber, which is mainly hollow. The cross-section fiber (hereinafter referred to as "hollow cross-section fiber"); and the mixed area is composed of a mixture of a solid cross-section fiber and a hollow cross-section fiber between the main area of the solid cross-section fiber and the main area of the hollow cross-section fiber; Repeated compression of 750N constant load during compression of the main area of the fiber of the solid section of the mesh structure after repeated compression After compression, any residual strain on the side of the main section of the hollow cross-section fiber is less than 20%; the difference between the residual strain on the side of the main section of the solid cross-section fiber and the residual strain on the side of the main section of the hollow cross-section fiber is 10 points or less.

The mesh structure system of the present invention has a structure with the following structure: A continuous linear body composed of a continuous linear body of a polyester-based thermoplastic elastomer and a continuous linear body of a polyolefin-based thermoplastic elastomer, having a dimension of 0.1 mm or more and 3.0 mm or less Bending to form a random ring, which is a three-dimensional random ring joining structure that makes the respective rings contact and join each other in a molten state. Any one of the continuous linear body of the polyester-based thermoplastic elastomer and the continuous linear body of the polyolefin-based thermoplastic elastomer of the continuous linear system fiber diameter of the thermoplastic elastomer of the present invention of 0.1 mm or more and 3.0 mm or less.

Examples of the polyester-based thermoplastic elastomer include a polyester ether block copolymer having a thermoplastic polyester as a hard segment and a polyalkylenediol as a soft segment, or an aliphatic polyester. Polyester block copolymer as a soft segment.

As a polyester ether block copolymer, it is a ternary block copolymer composed of: selected from terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7- Aromatic dicarboxylic acids such as dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, or alicyclic dicarboxylic acids such as 1,4-cyclohexane dicarboxylic acid, or succinic acid, adipic acid, Aliphatic dicarboxylic acid such as sebacic acid dimer, or at least one dicarboxylic acid among such ester-forming derivatives; selected from 1,4-butanediol, ethylene glycol, trimethylene dimer Aliphatic diols such as alcohol, tetramethylene glycol, pentamethylene glycol, and hexamethylene glycol, or lipids such as 1,1-cyclohexanedimethanol and 1,4-cyclohexanedimethanol Cyclic diol, or at least one diol component among these ester-forming derivatives; and the number average molecular weight of about 300 to 5000 At least one of polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and ethylene glycol-propylene oxide copolymer.

The polyester block copolymer is a ternary block copolymer composed of at least one of the above dicarboxylic acids and diols, and polyester diols such as polylactones having a number average molecular weight of about 300 to 5000. . In consideration of thermal adhesion, hydrolysis resistance, stretchability, heat resistance, etc., terephthalic acid and/or naphthalene-2,6-dicarboxylic acid are particularly preferred as the dicarboxylic acid; 1,4-butanediol As a diol component, a ternary block copolymer using polytetramethylene glycol as a polyalkylene glycol, or a ternary block copolymer using polylactone as a polyester diol. In a special case, a soft segment introduced with a polysiloxane system can also be used.

In addition, the polyester-based thermoplastic elastomer of the present invention includes those in which non-elastomeric components are mixed and copolymerized with the above-mentioned polyester-based thermoplastic elastomer, those in which polyolefin-based components are used as soft segments, and the like. In addition, it also includes the addition of various additives to the polyester-based thermoplastic elastomer.

In order to achieve the subject of the present invention, the net-like structure has different cushioning properties that can be imparted to both sides. No matter which side of the two sides is pressed, the difference in compression durability is small. The polyester-based thermoplastic elastomer has a soft chain The content of the segment is preferably 15% by weight or more, more preferably 25% by weight or more, still more preferably 30% by weight or more, and particularly preferably 40% by weight or more. In order to ensure hardness and heat resistance and permanent strain resistance, it is preferably 80% by weight or less, more It is preferably 70% by weight or less.

The component of the polyester-based thermoplastic elastomer constituting the mesh structure of the present invention preferably has an endothermic peak below the melting point in the melting curve measured by differential scanning calorimetry (DSC). Those with endothermic peaks below the melting point have significantly improved heat and permanent strain resistance than those without endothermic peaks. For example, as the preferred polyester-based thermoplastic elastomer of the present invention, the acid component of the hard segment contains 90 mol% or more of rigid terephthalic acid or naphthalene-2,6-dicarboxylic acid. Preferably, the content of terephthalic acid or naphthalene-2,6-dicarboxylic acid is 95 mol% or more, and particularly preferably 100 mol% is transesterified with a diol component and polymerized to a necessary degree of polymerization. Next, as the polyalkylene glycol, a polytetramethylene glycol having an average molecular weight of 500 or more and 5000 or less, more preferably 700 or more and 3000 or less, and still more preferably 800 or more and 1800 or less is preferably 15 In the case of a copolymerization amount of not less than 80% by weight, more preferably not less than 25% by weight and not more than 70% by weight, still more preferably not less than 30% by weight and not more than 70% by weight, and particularly preferably not less than 40% by weight and not more than 70% by weight, When the content of rigid terephthalic acid or naphthalene-2,6-dicarboxylic acid in the acid component of the hard segment is large, the crystallinity of the hard segment can be improved, and it is not easy to be plastically deformed. Furthermore, although the heat-resistant permanent strain resistance is improved, further annealing treatment at a temperature lower than the melting point by at least 10° C. or higher after melting and thermal adhesion can further improve the heat-resistant permanent strain resistance. The annealing treatment may be performed as long as the sample can be heat-treated at a temperature lower than the melting point by at least 10° C. or more, but by applying compressive strain, the heat resistance and permanent strain resistance are further improved. Will The network structure treated in this way is measured by a differential scanning calorimeter, and it has a more pronounced endothermic peak performance at a temperature above room temperature (eg, 20°C) or below the melting point in the melting curve. In addition, without annealing, there is no obvious endothermic peak in the melting curve below the melting point above room temperature (20°C). By analogy, it can be obtained whether the hard segment can be rearranged to form a quasi-stabilized mesophase by annealing to improve the heat resistance and permanent strain resistance. As a method of utilizing the heat resistance improvement effect of the present invention, it can be used for a vehicle mat using a heating device or a floor mat for floor heating, etc. This is useful because the resistance to permanent strain becomes good in relatively high temperature applications.

The polyolefin-based thermoplastic elastomer of the present invention is preferably an ethylene‧α-olefin copolymer obtained by copolymerizing ethylene and α-olefin, and more preferably is composed of ethylene‧α-olefin which is an olefin block copolymer. Block copolymer. The reason why the multi-block copolymer composed of ethylene and α-olefin is more preferable is that, in general random copolymers, the length of the main chain connecting chain becomes short and it is not easy to form a crystalline structure, which lowers the durability. The α-olefin copolymerized with ethylene is preferably an α-olefin having 3 or more carbon atoms.

Here, examples of the α-olefin having 3 or more carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, and 1 -Octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, etc. Preferably 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1- ten Monoene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene , 1-Eicosene. Moreover, these 2 or more types can also be used.

The random copolymer of the ethylene•α-olefin copolymer of the present invention can be obtained by copolymerizing ethylene and α-olefin by using a catalyst system using specific metal aromatic compounds and organometallic compounds as the basic structure. The multi-block copolymer can be obtained by copolymerizing ethylene and α-olefin using a chain shuttling reaction catalyst. Two or more types of polymers obtained by the above method, polymers such as hydrogenated polybutadiene or hydrogenated polyisoprene, etc. may be mixed according to needs.

The ethylene/α-olefin copolymer of the present invention preferably has a ratio of ethylene to an alpha-olefin having a carbon number of 3 or more, and an ethylene content of 70 mole% or more and 95 mole% or less and an alpha-olefin having a carbon number of 3 or more is 5 moles. More than 30% of ears and less than 30% of ears. In general, it is known that polymer compounds can obtain elastomer properties because there are hard segments and soft segments in the polymer chain. In the polyolefin-based thermoplastic elastomer of the present invention, ethylene is considered to play the role of a hard segment and α-olefins having a carbon number of 3 or more are considered to play a role of the soft segment. Therefore, if the proportion of ethylene is less than 70 mol%, the recovery performance of rubber elasticity is reduced due to the lack of hard segments. The proportion of ethylene is more preferably 75 mol% or more, and still more preferably 80 mol% or more. On the other hand, when the proportion of ethylene exceeds 95 mol%, the elastomer properties are not easily exhibited due to the small number of soft segments, and the cushioning performance deteriorates. The proportion of ethylene is more preferably 93 mol% Lower and better is below 90 mol%.

In the mesh structure of the present invention, in addition to the polyester-based thermoplastic elastomer or the polyolefin-based thermoplastic elastomer, a polybutadiene-based, polyisoprene-based, or benzene-based secondary material can be mixed as needed Ethylene-based polymer modifiers such as styrene-isoprene copolymers or styrene-butadiene copolymers or hydrogenated copolymers such as thermoplastic elastomers. In addition, phthalate-based, trimellitate-based, fatty acid-based, epoxy-based, adipate-based, or polyester-based plasticizers can be added; known hindered phenolic, Sulfur-based, phosphorous-based, or amine-based antioxidants; hindered amine-based, triazole-based, benzophenone-based, benzoate-based, nickel-based, or salicyl based light stabilizers; antistatic agents; Molecular weight regulators such as oxides; epoxy compounds, isocyanate compounds, compounds with reactive groups such as carbodiimide compounds; metal deactivators; organic and inorganic nucleating agents; neutralizers, antacids, Antibacterial agents, fluorescent whitening agents, fillers, flame retardants, flame retardant additives, organic and inorganic pigments. In addition, in order to improve heat resistance durability or permanent strain resistance, it is also effective to increase the molecular weight of the polyolefin-based thermoplastic elastomer.

One of the characteristics of the present invention is that different cushioning properties can be imparted to both sides. The method of obtaining a mesh structure that imparts different cushioning properties on both sides is that, in order to change their cushioning characteristics when compressed from both sides, at least in the thickness direction of the mesh structure: the main area of the medium solid cross-section fiber with thickness, mainly by The solid section fiber is formed to have a thickness; the main section of the hollow section fiber is mainly formed by the hollow section fiber to have a thickness; And the mixed area is an area other than the main area of the solid cross-section fiber and the main area of the hollow cross-section fiber.

In the main area of the fiber of the solid section and the main area of the fiber of the hollow section, "main" refers to the proportion of the number of fibers in the section relative to the total number of fibers contained in the area, which is more than 90%. In addition, in the mixed region where the solid cross-section fiber and the hollow cross-section fiber are located between the main region of the solid cross-section fiber and the main section of the hollow cross-section fiber, the total number of fibers included in the region The proportion of fiber roots of the cross-section fiber is lower than that of the main area of the solid cross-section fiber, and the proportion of fiber roots of the hollow cross-section fiber is lower than that of the main area of the hollow cross-section fiber relative to the total number of fiber roots contained in the area. That is, the mixed region is a region where the number of fibers of the solid-section fibers and the number of fibers of the hollow-section fibers are less than 90% of the total number of fibers contained in the region.

Here, the proportion of the number of fibers of each fiber in the predetermined area is measured by the following method. First, the sample was cut into 10 samples with a width of 3 cm × a length of 3 cm × the thickness of the sample, and the weight of each sample was measured with an electronic balance. Next, the fibers constituting the sample were pulled out one by one from the same surface side of each sample so as to reduce the sample thickness as evenly as possible. The work of pulling out the fibers one by one continues until the first time the sample weight becomes less than 90% of the weight of the sample originally prepared. Confirm the fiber profile of the extracted fiber by visual inspection, optical microscope, etc. Surface, separate the solid section fiber and the hollow section fiber, and count the number of fibers of the solid section fiber and the hollow section fiber. The total number of fibers of the middle solid cross-section fibers and hollow cross-section fibers of 10 samples was taken as the total number of fibers included in the region. The number of fibers of the solid cross-section fiber and the number of fibers of the hollow cross-section fiber are calculated from the number of fibers of the solid cross-section fiber and the number of fibers of the hollow cross-section fiber relative to the total number of fibers contained in the region Ratio to determine that this area is the main area of the solid section fiber, the main section of the hollow section fiber, or the mixed area.

Then, go back to the operation of pulling out the fibers from each sample, and continue the operation of pulling out the fibers one by one until the weight of the sample is first less than 80% of the weight of the initially prepared sample, in the same way as above, The number of fibers of the solid cross-section fiber and the number of fibers of the hollow cross-section fiber are calculated from the number of fibers of the solid cross-section fiber and the number of fibers of the hollow cross-section fiber relative to the total number of fibers contained in the region Ratio to determine that this area is the main area of the solid section fiber, the main section of the hollow section fiber, or the mixed area.

After that, the first time the sample weight becomes 70% or less of the first prepared sample weight, the first time the sample weight becomes 60% or less of the first prepared sample weight, and the first sample weight becomes the first Up to 50% of the weight of the prepared sample, the first time the weight of the sample becomes 40% or less of the weight of the initially prepared sample, and for the first time the weight of the sample becomes 30% of the weight of the initially prepared sample The weight of the sample is below 20% of the weight of the sample prepared for the first time, and the weight of the sample is below 10% of the weight of the sample prepared for the first time. Once the weight of the first prepared sample is 0% of the weight, the operation of pulling out fibers from each sample is repeated so that the weight of the sample changes every 10%. In the same manner as above, the number of fibers of the solid cross-section fiber and the number of fibers of the hollow cross-section fiber with respect to the total number of fibers included in each region are distinguished from the thickness direction of the surface side to calculate the The ratio of the number of fibers and the number of fibers of the hollow cross-section fibers can be determined as the main area of the solid cross-section fiber, the main area of the hollow cross-section fiber, or the mixed area.

Another feature of the present invention is that the difference in compression durability between the case where the mesh structure is pressurized from the main area of the solid cross section fiber and the case where the pressurization is from the side of the hollow cross section fiber main area is small. Specifically, the residual strain on the side of the solid section fiber main area after repeated compression from the 750N constant load of the main section of the solid section fiber and the repeated compression of the 750N constant load on the side section of the main section fiber of the hollow section The difference in the residual strain on the side of the hollow cross-section fiber main region is 10 points or less, preferably 9 points or less, more preferably 8 points or less, and still more preferably 6 points or less. If the difference between the residual strain on the side of the main section of the solid section fiber and the residual strain on the side of the main section of the hollow section fiber exceeds 10 points after repeated compression at a constant load of 750N, the main section side of the main section of the solid section fiber and the main section side of the hollow section fiber The difference in compression durability is too large, and there will be a mesh structure in the invention When the fabric is used in both positive and negative applications, the permanent strain condition (sag condition) of the mesh structure will vary according to the direction of use, which is not good. The lower limit of the difference between the residual strain on the side of the main section of the solid section fiber and the residual section on the side of the main section of the hollow section fiber after repeated compression at 750N constant load is that there is no difference between the main section side of the main section of the solid section fiber and the main section side of the hollow section fiber The difference in compression durability is 0 points. Here, in the present invention, the "difference value" refers to subtracting the small value from the large value among the two values. In addition, the "point" is the difference between the two values of "%", for example, the unit described below: the difference between the residual strain on the side of the main region of the fiber of the solid section and the residual strain on the side of the main region of the fiber of the hollow section .

In the mesh structure of the present invention, any of the residual strain on the side of the main section of the solid section fiber and the residual strain on the side of the main section of the hollow section fiber is 20% or less, preferably 15% or less, and more preferably 13% or less , And more preferably below 11%. It means that if the value of at least one of the residual strain on the side of the main region of the solid cross-section fiber and the residual strain on the side of the main region of the hollow cross-section fiber becomes a high value, the compression durability deteriorates.

Among the residual strains after repeated compression at a constant load of 750N, in order to reduce the difference between the residual strain on the side of the main section of the fiber of the solid section and the residual strain on the side of the main section of the fiber of the hollow section, it is important The mixed area where the solid section fiber and the hollow section fiber are mixed between the main section of the solid section fiber and the main section of the hollow section fiber is formed into a mesh structure by integrating these regions without separation The overall thickness.

Even if only the net structure mainly composed of hollow section fibers and the net structure mainly composed of hollow section fibers are superimposed, there is no mixture of the mixture of the solid section fibers and the hollow section fibers The non-integrated two-layer laminated network structure that can be easily separated in a region can still be given different cushioning properties on both sides. However, in the stacked laminated network structure described above, if compression is applied from one side of the mesh structure with a low compression hardness, the mesh structure with a low compression hardness is compressed and deformed first, and the mesh with a low compression hardness The shape-like structure flexes independently from the mesh-like structure with high compression hardness. Then, at a stage when the mesh structure with a low compression hardness cannot bear the compressive load, the compression stress is still transmitted to the mesh structure with a high compression hardness, and the mesh structure with a high compression hardness starts to deform or deflect. Therefore, if the compression and compression are repeated, the mesh structure with a low compression hardness accumulates fatigue first, and its thickness or compression hardness becomes lower than the mesh structure with a higher compression hardness. That is, although different cushioning properties can be imparted on both sides, it will become a net-like structure in which the difference in compression durability when pressed from both sides increases.

In addition, although there is no mixed area in which the solid cross-section fibers and the hollow cross-section fibers are mixed, by bonding the mesh structure mainly composed of the solid cross-section fibers and the mesh structure mainly composed of the hollow cross-section fibers The two laminated laminate structures that are bonded together to form an integrated body can still be given different cushioning properties on both sides. However, in the above laminated laminate network In the structure, in the initial stage of repeated compression, although the mesh structures on both sides are integrated and deformed and flexed with respect to the pressurized compression load, the stress is concentrated on the adhesive surface due to repeated compression, which will cause adhesive force. Because it is lowered or peeled off, the two laminated laminated structures are still mesh structures with greatly different differences in compression durability when pressed from both sides.

In addition, although there is no mixed region in which the solid cross-section fiber and the hollow cross-section fiber are mixed, the main region of the solid cross-section fiber and the hollow cross-section fiber are mainly constituted by fusion The integrated network structure formed by the main area of the hollow section fiber can still be given different cushioning properties on both sides. As described above, the mesh structure can be formed by fusing the solid section fibers above the mesh structure mainly composed of hollow section fibers to fuse and laminate the mesh structure mainly composed of medium section fibers Method. However, the mesh structure obtained by this method temporarily solidifies the hollow cross-section fibers and fuse the solid cross-section fibers. Therefore, the fusion strength of the interface between the hollow cross-section fiber layer and the solid cross-section fiber layer is low. If repeated compressive loads are applied, stress will concentrate on the interface and interface peeling will occur, which will result in poor durability.

The mesh structure of the present invention has a mixed region in which a solid cross-section fiber and a hollow cross-section fiber are mixed between the main area of the solid cross-section fiber and the main area of the hollow cross-section fiber, and is integrated without separating these areas When forming a net-like structure with the thickness of the entire net-like structure, even if it is compressed from the side with a low compression hardness, it passes through the mixing zone From the initial stage of compression, the stress can be propagated to the side with high compression hardness, and the stress can be efficiently dispersed in the thickness direction, so that the entire mesh structure can be deformed and flexed against the compression load. With this, the difference between the repeated compression durability when pressurized from the side with low compression hardness and the repeated compression durability when pressurized from the side with high compression hardness can be reduced.

The mesh structure of the present invention can be obtained by adding a new technique to a known method described in Japanese Patent Laid-Open No. 2014-194099. For example, by using a plurality of nozzles with a plurality of orifices and a plurality of different orifice diameters to be described later, any one of the polyester-based thermoplastic elastomer and the polyolefin-based thermoplastic elastomer is distributed to the nozzle orifice to compare with the above-mentioned thermoplastic The melting point of the elastomer is higher than 20°C and higher than 120°C, and the high spinning temperature (melting temperature) is discharged downward from the nozzle. In the molten state, the continuous linear bodies are brought into contact with each other and fused to form a three-dimensional structure. At the same time as the structure, it is sandwiched between the drawing conveyor belt net, cooled with cooling water in a cooling tank, taken out, drained and dried to obtain a net-like structure smoothed on both sides or one side. In the case of smoothing one side, spit out the inclined drawing net, contact and fuse with each other in the molten state to form a three-dimensional structure, and can relax the form on the drawing net surface and cool. The obtained network structure may also be annealed. In addition, the drying treatment of the mesh structure can also be performed by annealing treatment.

The obtained mesh structure may be heat-treated (annealed). The heat treatment is performed below the melting point of the thermoplastic elastomer, preferably at a temperature above 5°C below the melting point, more preferably at a temperature above 10°C below the melting point Degrees to process. The heat treatment temperature in the polyester-based thermoplastic elastomer is preferably 90°C or higher, more preferably 95°C or higher, and still more preferably 100°C or higher. In the polyolefin-based thermoplastic elastomer, it is preferably 70° C. or higher, more preferably 80° C. or higher, and still more preferably 90° C. or higher. The heat treatment time is preferably 1 minute or more, more preferably 10 minutes or more, still more preferably 20 minutes or more, and particularly preferably 30 minutes or more. Although the heat treatment time is better, the heat treatment effect will not increase over a certain period of time, and on the contrary, it will cause deterioration of the resin. Therefore, the heat treatment time is preferably within 1 hour.

When measuring the continuous linear body constituting the mesh structure of the present invention with a differential scanning calorimeter, it is preferable that the melting curve has an endothermic peak from room temperature (20°C) to the melting point or lower. In some cases, there may be more than two endothermic peaks below the melting point, and depending on the distance from the melting point or the shape of the baseline, it may become shoulders. Compared with those who do not have an endothermic peak, the heat and humidity resistance of those who have the endothermic peak are improved. As a practical method of improving the heat resistance and permanent strain resistance of the present invention, it can be used for vehicle mats with heating devices or floor mats for floor heating houses, etc., for the application of relatively repeated compression in a relatively high temperature environment, durability Become good and useful.

As a means for obtaining the mesh structure of the present invention, it is preferable to optimize the shape and size of the nozzle and the arrangement of the nozzle holes. The nozzle shape preferably has an aperture diameter of 1.5 mm or less when forming fine fibers, and preferably has an aperture diameter of 2 mm or more when forming coarse fibers. Also, although the nozzle opening of the coarse fiber is formed The shape preferably has hollow formability, and a C-shaped nozzle or a three-point bridge shape nozzle, etc. may be mentioned, but from the viewpoint of pressure resistance, a three-point bridge shape nozzle is preferable. The distance between the holes forming the fine fibers and the holes forming the thick fibers is preferably 4 mm or more and 12 mm or less, and more preferably 5 mm or more and 11 mm or less. Although the nozzle hole arrangement may be exemplified by a lattice arrangement, a circumferential arrangement, a staggered arrangement, etc., it is preferably a lattice arrangement or a staggered arrangement from the viewpoint of the quality of the mesh structure. Here, the inter-hole pitch means the distance between the centers of the nozzle holes, and there are the inter-hole pitch in the width direction of the mesh structure (hereinafter referred to as "width-direction inter-hole pitch") and the thickness of the mesh structure The pitch between holes in the direction (hereinafter referred to as "thickness pitch between holes"). The suitable inter-hole pitch described above describes the inter-hole pitch suitable for both the inter-hole pitch in the width direction and the inter-hole pitch in the thickness direction.

As a nozzle for obtaining the mesh structure of the present invention, a nozzle composed of the following three groups (a group, ab mixed group, and b group) may be mentioned.

Group a: A group of orifices formed by arranging orifice holes for medium-solid cross-section fibers in a plurality of rows in the thickness direction.

ab mixed group: an orifice hole group formed by mixing orifice holes for medium-solid-section fibers and orifice holes for hollow-section fibers and arranged in a plurality of rows in the thickness direction.

Group b: orifice hole group formed by arranging orifice holes for hollow cross-section fibers in a plurality of rows in the thickness direction.

In addition, as other nozzles, nozzles composed of the following two groups (α group and β group) may be mentioned: Alpha group: orifice hole group formed by arranging a plurality of rows of holes in the thickness direction for the solid section fiber; ß group: orifice hole group formed by arranging a plurality of rows in the thickness direction for the hollow section fiber In this nozzle, the difference between the widthwise hole pitch of the orifice for the solid cross-section fiber and the widthwise hole pitch of the orifice for the hollow cross-section fiber is small. From the viewpoint of simplifying the structure of the nozzle, a nozzle composed of the above-mentioned α group and β group is preferable.

Although there are two types of orifice hole groups as nozzles, the mixed region of the solid section fiber and the hollow section fiber is formed from the fiber system spun near the interface of the α group and the β group. A network structure composed of three types of regions in the thickness direction.

In order to obtain the net-like structure of the present invention where the difference in compression durability is small regardless of which side is pressed, it is necessary to make the width-to-hole spacing of the orifice for the solid section fiber and the hollow section fiber The difference in the spacing between the holes in the width direction of the orifice becomes smaller. Although the reason why the difference in the pitch between the holes in the width direction is small is not fully understood, the difference in durability also becomes small, but it can be presumed as follows.

In the mixed region where the solid cross-section fiber and the hollow cross-section fiber are mixed, the difference in the spacing between the holes in the width direction of the orifice is small, which means that in the mixing region, the number of constituents of the solid cross-section fiber and the hollow cross-section fiber is similar. among When the number of components of the solid cross-section fiber and the hollow cross-section fiber is similar, the solid cross-section fiber and the hollow cross-section fiber constitute a plurality of contacts in a manner of almost one to one. Therefore, it is considered that when either side is pressed, since the propagation of stress is easy, the difference in compression durability should be reduced regardless of which side is pressed.

On the other hand, in the case of forming a net-like structure with a nozzle having a large difference in pitch between holes in the width direction of the orifice, in the mixed region where the solid section fiber and the hollow section fiber are mixed, for example, the medium solid section fiber When the number of constituent fibers is greater than the number of components of hollow cross-section fibers, there will be a part of the solid cross-section fibers in the mixing region that has almost no contact with the hollow cross-section fibers. Therefore, when pressurized from the hollow section fiber side, there will be a solid section fiber that hardly propagates the stress by the hollow section fiber, and it is considered that these systems are propagated through the solid section fiber that transmits the stress from the hollow section fiber . On the other hand, when pressurized from the side of the solid section fiber, there are solid section fibers that cannot propagate the stress to the hollow section fiber, and these systems are considered to pass through the solid section fiber that can propagate the stress to the hollow section fiber The stress propagates to the hollow section fiber.

That is, in the case of forming a net-like structure with a nozzle having a large difference in pitch between holes in the width direction of the orifice, the propagation direction of the stress is dispersed in the mixed region in which the solid section fiber and the hollow section fiber are mixed In the thickness direction and the direction perpendicular to the thickness direction, the stress propagation efficiency is reduced, so it is considered that the case of pressurizing from the fiber side of the solid section and the hollow section The difference in compression durability when the face fiber side is pressed increases.

The difference between the widthwise hole pitch of the hole for the solid cross-section fiber and the width direction hole of the hole for the hollow cross-section fiber is preferably 2 mm or less, more preferably 1 mm or less, and still more preferably 0 mm. The spacing between holes in the same width direction.

The fiber diameter (average fiber diameter, the same applies hereinafter) of the continuous linear body constituting the mesh structure of the present invention is 0.1 mm or more and 3.0 mm or less, preferably 0.2 mm or more and 2.5 mm or less, and more preferably 0.3 mm or more Below 2.0mm. If the fiber diameter is less than 0.1 mm, it will be too thin. Although it has good compactness and soft touch, it is difficult to obtain the necessary hardness as a mesh structure. Although the fiber diameter exceeds 3.0 mm, a mesh structure with sufficient hardness can be obtained, but the mesh structure becomes rough and deteriorates other cushioning properties. From this viewpoint, the plural fiber diameters must be set within an appropriate range.

If the continuous linear bodies constituting the mesh structure of the present invention have the same fineness, the hollow cross-section fibers will have a higher second moment of area than the solid cross-section fibers, so hollow cross-section fibers are used The compression resistance will become higher. Therefore, in order to obtain a more pronounced two-sided cushioning performance, it is preferable that the fiber diameter of the hollow cross-section fiber is larger than that of the fiber of the solid cross-section.

Continuous linear hollow section fibers constituting the net-like structure of the present invention The difference in fiber diameter from the medium-solid cross-section fiber (the difference in average fiber diameter, the same applies below) is preferably 0.07 mm or more, more preferably 0.10 mm or more, still more preferably 0.12 mm or more, and particularly preferably 0.15 mm or more, particularly preferably 0.20mm or more, and most preferably 0.25mm or more. In the present invention, the upper limit of the difference in fiber diameter is preferably 2.5 mm or less. If the difference in fiber diameter is less than 0.07 mm, the difference in cushioning performance on both sides becomes smaller. Conversely, if the difference in fiber diameter is too large, the foreign body sensation will be too strong. Therefore, it must be set within a suitable range.

The total weight ratio of the medium-solid cross-sectional fibers constituting the mesh structure of the present invention is preferably 10% or more and 90% or less with respect to the total fibers constituting the mesh structure. In order to give the mesh structure of the present invention good positive and negative versatility, it is more preferably 20% or more and 80% or less, and still more preferably 30% or more and 70% or less. If less than 10% and more than 90%, the difference between the cushioning performance of the two sides will become smaller.

The continuous linear body constituting the mesh structure of the present invention may be in a composite linear shape combined with other thermoplastic resins without impairing the object of the present invention. As the composite form, when the linear body itself is compounded, for example, a sheath-core type, a side-by-side type, and an eccentric sheath -core type) and other composite linear bodies.

Although the cross-sectional shape of the continuous linear body constituting the mesh structure of the present invention is preferably that both the solid cross-section fiber and the hollow cross-section fiber have a substantially circular shape, there may be cases where different shapes of cross-sections can be given to the compression resistance or touch .

The network structure system of the present invention can provide deodorization, antibacterial, deodorization, mildew resistance, coloring, aroma, and resistance at any stage from the resin manufacturing process to the processing and productization of the molded body within the range of not reducing performance. Processing and processing of chemicals such as combustion, moisture absorption and moisture addition.

The mesh structure of the present invention includes those formed in any shape. For example, it also includes a plate-shaped, triangular column, polygonal, cylindrical, spherical, or a mesh-shaped structure including these types. These forming methods can be performed by known methods such as cutting, hot pressing, and non-woven fabric processing.

The mesh structure of the present invention is also included in a part of the mesh structure having the mesh structure of the mesh structure of the present invention.

The apparent density of the mesh structure of the present invention is preferably 0.005 g/cm ³ or more and 0.20 g/cm ³ or less, more preferably 0.01 g/cm ³ or more and 0.18 g/cm ³ or less, and still more preferably 0.02 g/ cm ³ or more and 0.15 g/cm ³ or less. If the apparent density is less than 0.005 g/cm ^3, it is difficult to obtain the hardness required for use as a cushioning material, whereas if it exceeds 0.20 g/cm ^3, it becomes too hard and may not be suitable for cushioning materials.

The thickness of the mesh structure of the present invention is preferably 5 mm or more, and more preferably 10 mm or more. If the thickness is less than 5 mm, it may be too thin when used as a cushioning material and may cause a bottoming feeling. The upper limit of the thickness depends on the manufacturing device The relationship is preferably 300 mm or less, more preferably 200 mm or less, and still more preferably 120 mm or less.

In the mesh structure of the present invention, from a mesh structure having a three-dimensional random loop joint structure composed of a polyester-based thermoplastic elastomer, when the main section side of the solid section fiber is compressed at 25% when compressed The hardness and the hardness at 25% compression when pressed from the main region side of the hollow cross-section fiber are preferably 10 N/φ100 mm or more, and more preferably 20 N/φ100 mm or more. If the hardness at 25% compression is less than 10N/φ100mm, the hardness of the cushioning material may be insufficient and the bottoming feeling may occur. Although there is no particular upper limit to the hardness at 25% compression, it is preferably 1.5 kN/φ100 mm or less.

25% of the hardness at the time of compression of the main area of the solid cross-section fiber and the pressure of the main area of the hollow cross-section fiber from the mesh structure having a three-dimensional random ring joint structure composed of a polyolefin-based thermoplastic elastomer The hardness at the time of 25% compression is preferably 2N/φ100mm or more, and more preferably 5N/φ100mm or more. If the hardness at 25% compression is less than 2N/φ100mm, the hardness of the cushioning material may be insufficient and a bottoming feeling may occur. Although there is no particular upper limit to the hardness at 25% compression, it is preferably 1.5 kN/φ100 mm or less.

When the mesh structure of the present invention is composed of either a polyester-based thermoplastic elastomer or a polyolefin-based thermoplastic elastomer, when pressurized from the main solid fiber side Hardness at 25% compression and pressure from the main area side of the hollow section fiber The ratio of hardness at 25% compression is preferably 1.03 or more, more preferably 1.05 or more, still more preferably 1.07 or more, particularly preferably 1.10 or more, and most preferably 1.20 or more. If the ratio of the hardness at 25% compression is less than 1.03, the difference between the cushioning properties on both sides will become smaller. Here, the "ratio" in this case refers to the ratio of the large value to the small value among the two values, which is equal to the value obtained by dividing the large value by the small value.

In the mesh structure of the present invention, from the mesh structure having a three-dimensional random loop joint structure composed of a polyester-based thermoplastic elastomer, when compressed at 40% when the main section side of the solid section fiber is compressed The hardness and the hardness at 40% compression when pressed from the main region side of the hollow cross-section fiber are preferably 20 N/φ100 mm or more, more preferably 30 N/φ100 mm or more, and still more preferably 40 N/φ100 mm or more. If the hardness at 40% compression is less than 20N/φ100mm, the hardness of the cushioning material may be insufficient and a bottoming feeling may occur. Although there is no particular upper limit to the hardness at 40% compression, it is preferably 5 kN/φ100 mm or less.

40% compression hardness at the time of compression of the main area of the solid section fiber and compression at the main area side of the hollow section fiber from the mesh structure having a three-dimensional random ring joint structure composed of a polyolefin-based thermoplastic elastomer The hardness at the time of 40% compression is preferably 5N/φ100mm or more, more preferably 10N/φ100mm or more, and still more preferably 15N/φ100mm or more. If the hardness at 40% compression is less than 5N/φ100mm, the hardness of the cushioning material may be insufficient and the bottoming feeling may occur. Although there is no special requirement for the hardness at 40% compression The upper limit is preferably 5 kN/φ100 mm or less.

When the mesh structure of the present invention is composed of either a polyester-based thermoplastic elastomer or a polyolefin-based thermoplastic elastomer, when pressurized from the main solid fiber side The ratio of the hardness at 40% compression to the hardness at 40% compression when pressed from the main region side of the hollow cross-section fiber is preferably 1.05 or more, more preferably 1.07 or more, still more preferably 1.10 or more, and particularly preferably 1.15 or more , The best is above 1.20. If the ratio of the hardness at 40% compression is less than 1.05, the difference between the cushioning properties on both sides will become smaller.

Regarding the mesh structure of the present invention, whether the mesh structure is composed of a polyester-based thermoplastic elastomer or a polyolefin-based thermoplastic elastomer, from the mesh structure The compressive deformation coefficient when the main section side of the solid section fiber is pressurized and the compressive deformation coefficient when the main section side of the hollow section fiber is pressed are preferably 2.5 or more and 10.0 or less, more preferably 2.6 or more and 9.0 or less, and more Jiajia is above 2.7 and below 8.0. If the compression deformation coefficient is less than 2.5, the difference in cushioning performance with respect to the change in compression ratio becomes small, and the sleeping comfort or the sitting comfort may deteriorate. Conversely, if it exceeds 10.0, the difference in the cushioning performance of the change in compression ratio becomes too large, and there may be a feeling of bottoming or violation.

Regarding the mesh structure of the present invention, whether the mesh structure is made of polyester In the case of the thermoplastic elastomer and the polyolefin thermoplastic elastomer, the compression deformation coefficient when pressurized from the main region of the solid cross-section fiber is increased from the main region of the hollow cross-section fiber. The difference in compressive deformation coefficient during compression is preferably 5 or less. If the difference in compression deformation coefficient exceeds 5, there will be a feeling of bottoming or a sense of violation when using the side with higher compression deformation coefficient. Although there is no particular limitation on the lower limit of the difference between the compression deformation coefficients, in the present invention, it is preferably 0 or more with no difference at all.

In the mesh structure of the present invention, when the solid section fiber main region side is pressurized from the mesh structure having a three-dimensional random ring joint structure composed of a polyester-based thermoplastic elastomer, and from the hollow section fiber, The hysteresis loss when the area side is pressurized is preferably 30% or less, more preferably 29% or less, still more preferably 28% or less, and particularly preferably 26% or less. If the hysteresis loss exceeds 30%, it is impossible to maintain the high-rebound sleeping comfort or sitting comfort of the mesh structure of the present invention. Although the lower limit of the hysteresis loss is not particularly specified, it is preferably 1% or more in the present invention.

The hysteresis loss of the solid section fiber main area side pressurization and the hollow section fiber main area side compression is preferable from the mesh structure having a three-dimensional random ring joint structure composed of a polyolefin-based thermoplastic elastomer It is 60% or less, more preferably 55% or less, more preferably 50% or less, and particularly good 45% or less. If the hysteresis loss exceeds 60%, it is impossible to maintain the high-rebound sleeping comfort or sitting comfort of the mesh structure of the present invention. Although none The lower limit of the hysteresis loss is specifically specified, but in the present invention, it is preferably 1% or more.

In the mesh structure of the present invention, whether the mesh structure is composed of a polyester-based thermoplastic elastomer or a polyolefin-based thermoplastic elastomer, if compared The hysteresis loss during compression of the main area of the profile fiber and the hysteresis loss during compression from the main area of the hollow profile fiber, the hysteresis loss on the side with lower hardness during compression has a hysteresis loss on the side with higher hardness during compression High tendency.

In addition, in the present invention, the residual strain, compressive hardness of 25%, 40%, and 65% after repeated compression at a constant load of 750N, and when pressurized from the main area side of the fiber of the solid section and from the main area side of the fiber of the hollow section The hysteresis loss at that time can be measured with a universal testing machine such as an Instron universal testing machine manufactured by Instron Japan Company Limited, a precision universal testing machine AUTOGRAPH AG-X plus manufactured by Shimadzu Corporation, and a Tensilon universal material testing machine manufactured by ORIENTEC Corporation.

In the mesh structure of the present invention, the difference between the hysteresis loss when pressurized from the main area of the solid cross-section fiber and the hysteresis loss when pressurized from the main area of the hollow cross-section fiber is preferably 5 minutes or less. If the difference of the above-mentioned hysteresis loss exceeds 5 points, the sleeping comfort or sitting comfort of the high rebound of the mesh structure cannot be maintained. Although the lower limit of the difference in hysteresis loss is not particularly specified, in the present invention, it is preferably 0 or more with no difference.

The net structure system of the present invention thus obtained can impart different cushioning properties on both sides. In the past, when manufacturing a mat that can impart different cushioning performances on both sides, a mesh structure and a mesh structure of different designs, hard cotton, urethane, or the like are laminated on the outer cover. Although these have good cushioning properties, they still have the following problems: no matter which side you start using and then use the other side, the compression durability will be different, or it will become a product with a higher manufacturing cost, or you must separate Recycling makes recycling complicated. The mesh structure system of the present invention that has a small difference in compression durability between the two sides of the mesh structure alone and can impart different cushioning properties to the two sides can solve these problems.

The cushioning material of the present invention includes the above-mentioned mesh-like structure inside the mat, and can be used in both directions. In the present invention, both positive and negative can mean that it can be used from any side of the solid section fiber main region side or the hollow section fiber main region side of the mesh structure contained in the cushioning material. Therefore, in the usage mode, even if only one side of the main region of the solid cross-section fiber or the main region of the hollow cross-section fiber is used, it is a user who is in accordance with the present invention.

[Example]

Although the following examples illustrate the present invention, but the present invention is not limited thereto. The measurement and evaluation of characteristic values of the examples were carried out as follows. In addition, although the sample size is based on the size described below, when the sample is insufficient, the sample size of the available size is used.

(1) Fiber diameter (mm)

The sample was cut into a width of 10 cm×10 cm in length×thickness of the sample, and then a linear body of 10 solid cross-section fibers and 10 hollow cross-section fibers of approximately 5 mm in length was randomly collected from the thickness direction of the cut section. After adjusting the collected linear system with an optical microscope at an appropriate magnification and adjusting the focal length at the fiber diameter measurement point, the fiber thickness seen from the side of the fiber is measured. However, the average fiber diameter is calculated as the average of the different regions of the fiber diameter: unit mm (average value of each n=10). That is, the fiber diameter of the solid cross-section fiber and the hollow cross-section fiber refers to the average fiber diameter of the respective fibers. In addition, the measurement of the fiber diameters of Comparative Examples I-2 and II-1 is to randomly collect 10 fibers of a length of about 5 mm from the thickness direction of the cut section, and adjust the focal length of the fiber diameter measurement position with an appropriate magnification using an optical microscope After that, the fiber thickness seen from the side of the fiber is measured. In addition, in order to obtain the smoothness of the surface of the mesh structure, the fiber may be crushed to deform the fiber cross section, so the sample is not collected from a region within 2 mm of the surface of the mesh structure.

(2) Difference in fiber diameter (mm)

The average value of the fiber diameters of the solid cross-section fiber and the hollow cross-section fiber measured in (1) above is taken, and the difference in fiber diameter is calculated according to the following formula.

(Difference in fiber diameter) = | (average fiber diameter of hollow cross-section fibers)-(average fiber diameter of solid cross-section fibers) |: unit mm.

That is, the difference between the fiber diameters of the hollow cross-section fiber and the hollow cross-section fiber refers to the average fiber diameter of the solid cross-section fiber and the average fiber of the hollow cross-section fiber The difference in diameter. In addition, in Comparative Examples I-2 and II-1, the difference in fiber diameter was calculated according to the following formula.

(Difference in fiber diameter) = | (average fiber diameter of coarse fibers)-(average fiber diameter of thin fibers) |: unit mm.

The difference in fiber diameter between the coarse fiber and the fine fiber is also the same as above.

(3) Proportion of total weight of medium-solid fiber (%)

The sample was cut into a size of 5 cm in width direction × 5 cm in length direction × thickness of sample. The fibers constituting this sample were confirmed by visual inspection, optical microscope, etc. and classified into solid cross-section fibers and hollow cross-section fibers. Thereafter, the total weight of only the solid cross-section fiber and the total weight of the hollow cross-section fiber are measured. The proportion of the total weight of the fibers of the middle solid section is calculated according to the following formula.

(Proportion of total weight of solid section fibers) = (total weight of solid section fibers)/(total weight of solid section fibers + total weight of hollow section fibers) × 100: unit %.

(4) Hollow rate (%)

The sample was cut into a width of 5 cm × a length of 5 cm × the thickness of the sample, and 10 linear bodies of hollow cross-section fibers were randomly collected from the thickness direction of the cut section outside the range of 10% on both sides of the sample surface in the thickness direction . The collected linear body is cut in the cross-sectional direction, and is placed on a cover glass in an upright direction toward the fiber axis direction, and a fiber cross-sectional photo of the cross-sectional direction is obtained by an optical microscope. Obtain the area of hollow part (a) and the total area of fiber including hollow part (b) based on the cross-sectional photos, based on The following formula calculates the hollow rate.

(Hollow rate)=(a)/(b)×100 (unit %, average value of n=10).

(5) Thickness and apparent density (mm and g/cm ³ )

The sample was cut into 4 samples with a width of 10 cm × a length of 10 cm × the thickness of the sample, and placed under no load for 24 hours. Then, with the fiber surface side of the middle solid section facing upwards, the height of one place of each sample was measured with a FD-80N thickness gauge made of a polymer meter using a circular gauge with an area of 15 cm ^{2 to} obtain 4 The average value of the samples is taken as the thickness. In addition, the average of the weights of the four samples measured by placing the sample on the electronic balance was determined as the weight. The apparent density is obtained from the average sample weight and average sample thickness according to the following formula.

(Apparent density)=(weight)/(thickness×10×10): unit g/cm ³ .

(6) Melting point (Tm) (℃)

Using a differential scanning calorimeter Q200 manufactured by TA INSTRUMENTS, the temperature of the endothermic peak (melting peak) was obtained from the endothermic and exothermic curve measured at a heating rate of 20°C/min.

(7) Residual strain after repeated compression at 750N constant load (%)

Cut the sample into a width of 40cm × length of 40cm × thickness of the sample, and place it in an environment of 23℃±2℃ under no load for 24 hours, then use the universal testing machine in the environment of 23℃±2℃ ( Instron Universal Testing Machine manufactured by Instron Japan Company Limited). To A pressure plate with a diameter of 200 mm and a thickness of 3 mm is used as a center to arrange the sample, and the thickness when the load is 5 N is measured by a universal testing machine as the initial hardness tester thickness (c). Immediately afterwards, using ASKER STM-536 and in accordance with JIS K6400-4 (2004) Method A (constant load method) as a reference, the sample of which thickness has been measured is repeatedly compressed at a constant load of 750N. Pressurizers are used in the circle with a radius of 25±1mm at the boundary of the bottom surface, a diameter of 250±1mm, a thickness of 3mm, and a flat lower surface. The following repeated compressions are carried out: load 750±20N, compression frequency per minute 70±5 times, the number of repeated compressions is 80,000 times, and the time of pressurizing to a maximum of 750±20N is less than 25% of the time required for repeated compressions. After the repeated compression is completed, the test piece is left unstressed for 10±0.5 minutes, and a universal testing machine (Instron Universal Testing Machine manufactured by Instron Japan Company Limited) is used, centering on a pressure plate with a diameter of 200 mm and a thickness of 3 mm. Dispose the sample, and use a universal testing machine to measure the thickness when the load is 5N, as the thickness of the hardness tester after repeated compression (d). The residual strain of 750N constant load after repeated compression is calculated using the initial hardness tester thickness (c) and the repeated compression hardness tester thickness (d) according to the following formula.

(Residual strain after 750N constant load repeated compression) = {(c)-(d)}/(c)×100: unit% (average value of n=3).

In the above measurement system, the case where the pressure is applied from the side of the main area of the fiber of the solid cross section and the case where the pressure is applied from the side of the main area of the fiber of the hollow cross section are measured. In this case, the case where the pressure is applied from the side of the main section of the solid section fiber is regarded as the residual strain on the side of the fiber of the section of the solid section, and the pressure is applied from the side of the main section of the fiber of the hollow section In the case of residual strain on the fiber side of the hollow cross-section, and each sample for measuring the residual strain is prepared and measured.

(8) The difference between the residual strain on the side of the main area of the fiber in the solid section and the residual strain on the side of the main area of the fiber in the hollow section (min)

Using the residual strain on the main region side of the fiber in the solid section and the residual strain on the main region side in the fiber in the hollow section calculated in (7) above, the calculation is performed according to the following formula.

(The difference between the residual strain after 750N constant load repeated compression when the main section side of the solid section fiber is compressed and the residual strain after repeated compression 750N constant load when the main section side of the hollow section fiber is pressed) =|(From The residual strain after repeated compression of 750N constant load when the main section side of the solid section fiber is pressurized)-(The residual strain after repeated compression of 750N constant load when the main section side of the hollow section fiber is compressed)|: unit points

(9) 25%, 40%, 65% compression hardness (N/φ100mm)

Cut the sample into a width of 20cm × length of 20cm × thickness of the sample, and place it in an environment of 23℃±2℃ under no load for 24 hours, then a universal testing machine in an environment of 23℃±2℃ ( Instron Universal Testing Machine manufactured by Instron Japan Company Limited) uses a pressure plate with a diameter of φ100mm, a thickness of 25±1mm, a boundary portion of the bottom surface with a radius of curvature of 10±1mm, and a flat lower surface, at a speed of 1mm/min at the center of the sample Compression is started, and the thickness at a load of 0.4 N is measured by a universal testing machine as the thickness of the hardness tester. The pressure plate at this time The position is used as the zero point, and after the thickness of the hardness tester is measured, it is compressed to 75% of the thickness of the hardness tester at a speed of 10mm/min, and then the pressure plate is returned to the zero point at a speed of 10mm/min, and the compression is continued at a speed of 10mm/min. To 25%, 40%, 65% of the thickness of the hardness tester, measure the load at this time, as 25% compression hardness, 40% compression hardness, 65% compression hardness: unit N/φ100mm (n=3 average value). In the above measurement system, the conditions when the pressure is applied from the side of the main area of the fiber of the solid cross section and when the pressure is applied from the side of the main area of the fiber of the hollow cross section are measured. In this system, samples for measuring the hardness during compression at the main region side of the solid cross-section fiber and the sample for measuring the hardness during compression at the main region side of the hollow cross-section fiber are prepared and measured.

(10) The ratio of the 25% compression hardness when compressed from the main area side of the solid section fiber to the 25% compression hardness when compressed from the main section side of the hollow section fiber (-)

The hardness at the time of compression of 25% of the main area of the main section of the solid section fiber and the side of the main section of the hollow section fiber measured by (9) above is calculated according to the following formula for the following cases.

‧(25% compression hardness when compressed from the main area side of the solid section fiber) ≧ (25% compression hardness when compressed from the main section side of the hollow section fiber)

(The ratio of 25% compression hardness when compressed from the main area of the solid cross-section fiber to 25% compression hardness when compressed from the main area of the hollow cross-section fiber) = ( At 25% compression Hardness)/(25% compression hardness when compressed from the main area side of the hollow cross-section fiber).

‧(25% compression hardness when compressed from the main area side of the solid section fiber)<(25% compression hardness when compressed from the main section side of the hollow section fiber)

(The ratio of the 25% compression hardness when compressed from the main area side of the solid section fiber to the 25% compression hardness when compressed from the main section side of the hollow section fiber) = (the pressure from the main section side of the hollow section fiber) 25% compression hardness)/(25% compression hardness when pressed from the main area of the fiber of the solid section).

(11) The ratio of 40% compression hardness when compressed from the main area side of the solid section fiber to the 40% compression hardness when compressed from the main section side of the hollow section fiber (-)

The hardness at the time of compression of 40% of the main area of the main section of the fiber of the solid section and the side of the main section of the hollow section of the fiber measured by (9) above is calculated according to the following formula for the following cases.

‧(Hardness at 40% compression when compressed from the main region side of the solid section fiber) ≧(Hardness at 40% compression when compressed from the main region side of the hollow section fiber)

(The ratio of 40% compression hardness when compressed from the main area of the solid cross-section fiber to the 40% compression hardness when compressed from the main area of the hollow cross-section fiber) = ( 40% compression hardness)/(40% compression when compressed from the main area side of the hollow section fiber) hardness).

‧(Hardness at 40% compression when compressed from the main area side of the solid section fiber)<(Hardness at 40% compression when compressed from the main section side of the hollow section fiber)

(The ratio of the hardness at 40% compression when compressed from the main region side of the solid cross-section fiber to the hardness at 40% compression when compressed from the main region side of the fiber at the hollow cross-section) = ( 40% compression hardness)/(40% compression hardness when pressed from the main area of the fiber of the solid section).

(12) Compression deformation coefficient (-)

The compressive deformation coefficient is based on (9) the 25% compression hardness when compressed from the main region side of the solid cross-section fiber as (e), and the 65% compression hardness when compressed from the main region side of the solid cross-section fiber as the (f) 25% compression hardness when the main section of the hollow cross-section fiber is compressed as (g), and 65% compression hardness when the main section of the hollow cross-section fiber is compressed as (h), based on It is calculated by the following formula.

(Compression deformation coefficient when pressurized from the main area side of the fiber of the middle solid section) = (f)/(e): (average value of n = 3).

(Compression coefficient of compression when pressed from the main section side of the hollow cross-section fiber) = (h)/(g): (average value of n = 3).

(13) Compression deformation coefficient when the fiber is pressed from the main area of the solid cross section and the compression deformation coefficient when the fiber is pressed from the main area of the hollow cross section Difference between numbers (-)

The compression deformation coefficient calculated by (12) above is calculated according to the following formula.

(The difference between the compressive deformation coefficient when the fiber is pressed from the main area of the solid section and the compressive deformation coefficient when the fiber is pressed from the main area of the hollow section) =| Coefficient)-(compressive deformation coefficient when pressed from the main area side of the hollow section fiber)|.

(14) Hysteresis loss (%)

Cut the sample into a width of 20cm × length of 20cm × thickness of the sample, and place it in an environment of 23℃±2℃ under no load for 24 hours, then a universal testing machine in an environment of 23℃±2℃ ( Instron Universal Testing Machine manufactured by Instron Japan Company Limited) uses a pressure plate with a diameter of φ100mm, a thickness of 25±1mm, a boundary portion of the bottom surface with a radius of curvature of 10±1mm, and a flat lower surface, at a speed of 1mm/min at the center of the sample Compression is started, and the thickness at a load of 0.4 N is measured by a universal testing machine as the thickness of the hardness tester. The position of the pressure plate at this time was taken as the zero point, and after the thickness measurement of the hardness tester was compressed to 75% of the thickness of the hardness tester at a speed of 10 mm/min, the pressure plate was returned to the zero point at a speed of 10 mm/min immediately ( The first stress-strain curve). After returning to the zero point, it is immediately compressed again to 75% of the thickness of the hardness meter at a speed of 10 mm/min, and immediately returned to the zero point at the same speed (second stress-strain curve).

In the second stress-strain curve of FIG. 1A, the second compression stress-strain curve of FIG. 1B represents compression energy (WC), and the second stress-strain curve of FIG. 1C during compression represents compression energy (WC '), and according to the following formula to obtain the hysteresis loss.

(Hysteresis loss)=(WC-WC’)/WC×100: unit %.

WC=ʃPdT (from 0% to 75% compression workload).

WC’=ʃPdT (from 75% to 0% decompression workload).

The above-mentioned hysteresis loss can be calculated by a simple method, for example, if a stress-strain curve as shown in FIG. 1A to FIG. 1C is obtained by computer analysis based on data. Alternatively, the area of the hatched portion may be WC, and the area of the dot portion may be WC', and the weight of the portion cut out from the difference in these areas may be obtained (average value of n=3).

The above-mentioned hysteresis loss is measured when the fiber is pressurized from the main region side of the solid section fiber and when the fiber is pressurized from the main region side of the hollow section fiber. In this system, samples for measurement on the side of the main area of the fiber of the solid cross section and samples for measurement of the side of the main area of the fiber of the hollow cross section are prepared and measured.

(15) The difference between the hysteresis loss when the pressure is applied from the main area of the fiber of the solid section and the hysteresis loss when the pressure is applied from the side of the fiber of the hollow section

The hysteresis loss calculated by (14) above is calculated according to the following formula.

(The difference between the hysteresis loss when the pressure is applied from the main area side of the solid section fiber and the hysteresis loss when the pressure is applied from the main area side of the hollow section fiber) =| (Hysteresis loss when pressure is applied from the main section side of the hollow section fiber)|: unit points.

[Example I-1]

As a polyester-based thermoplastic elastomer, dimethyl terephthalate (DMT) and 1,4-butanediol (1,4-butanediol; 1,4-BD) and a small amount of catalyst are prepared, After transesterification by a conventional method, polytetramethylene glycol (PTMG) with an average molecular weight of 1000 is added, and the temperature and pressure are reduced to perform polycondensation, thereby generating a polyetherester block copolymer elastomer. Next, 1% of an antioxidant was added and kneaded, then granulated, and vacuum-dried at 50° C. for 48 hours to obtain a polyester-based thermoplastic elastomer (A-1). The polyester-based thermoplastic elastomer (A-1)-based soft segment content rate was 40% by weight, and the melting point was 198°C.

On the nozzle effective surface with a length of 50 cm in the width direction and a length of 67.6 mm in the thickness direction, the shape of the orifice is a triple bridge with an outer diameter of 3 mm and an inner diameter of 2.6 mm in the thickness direction from the first row to the seventh row (triple bridge) The hollow forming orifices are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm, and the eighth to fourteenth rows in the thickness direction are formed with a medium diameter of 1 mm. Forming holes The nozzles are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm. Using the nozzle designed above, the obtained polyester-based thermoplastic elastomer (A-1) is spun at the spinning temperature (melted (Temperature) At 240°C, discharge at a rate of 1.5 g/min for a single hole of a hollow hole and 0.9 g/min for a single hole of a solid hole. Dispose the cooling water below 28 cm of the nozzle surface. An endless net made of stainless steel with a width of 60 cm is arranged in parallel with an opening width of 52 mm so that a pair of pull conveyor belt nets can be partially exposed on the water surface, and the melted state is made on the conveyor belt net on the water surface The spitting thread twists to form a ring and forms a three-dimensional mesh structure when the contact portion is welded. While pulling on both sides of the molten mesh structure with a pulling conveyor belt net, it is pulled at 1.14m/min After being drawn into cooling water at a speed, the two surfaces in the thickness direction are flattened by solidification, and then cut to a predetermined size and dried and heat-treated in hot air at 110° C. for 15 minutes to obtain a mesh structure.

The obtained network structure system includes: the main area of the middle section fiber, which is mainly composed of the middle section fiber; the main section of the hollow section fiber, which is mainly composed of the hollow section fiber; and the mixed area, which is located in the middle section fiber The solid section fiber and the hollow section fiber are mixed between the main area and the hollow section fiber main area. These areas are integrated mesh structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollow ratio of 20% and a fiber diameter of 0.76 mm. The solid-section fiber system forms a medium-solid linear body with a fiber diameter of 0.50 mm, and the difference in fiber diameter is 0.26 mm, the total weight ratio of the medium-solid fiber is 38%, the apparent density is 0.055 g/cm ³ , and the surface is flat The thickness is 50mm.

The residual strain on the main section side of the hollow section fiber is 6.7%, the residual strain on the main section side of the solid section fiber is 5.7%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber It is 1.0 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 45.1N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 32.1N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 1.40. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 75.1N/φ100mm, and the hardness of 40% compression at the main section side of the solid section fiber when compressed is 61.3N/φ100mm, from the solid section fiber The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.23. The compressive deformation coefficient of the hollow section fiber main area when compressed is 4.07, and the compressive deformation coefficient of the medium section solid fiber area is 5.99. The difference in compressive deformation coefficient of the hollow section fiber at the main region side when pressed is 1.92. Hysteresis loss from the hollow cross-sectional view of the pressure side region of the main fiber 23.7%, the hysteresis loss from the solid fibers are mainly cross-sectional area of the pressure side of ^26.2%, the hysteresis loss from the solid fibers are mainly cross-sectional area of the pressure side The difference in hysteresis loss when pressurized from the main section side of the hollow section fiber is 2.5 points. Table 1 shows the characteristics of the obtained mesh structure.

As shown in Table 1, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the middle solid section fiber main area side after 750N constant load repeated compression is less than 20% and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is 30% or less and the difference between them is 5 points or less. Because the value is small, the difference in compression durability on both sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, it imparts different cushioning properties on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Example I-2]

Except that the cooling water is arranged below 32 cm of the nozzle surface, the other network structure system obtained in the same manner as in Example I-1 contains: the main area of the middle solid section fiber, which is mainly composed of the middle solid section fiber; the hollow section fiber mainly The area is mainly composed of hollow section fibers; and the mixed area is composed of the mixture of the solid section fibers and the hollow section fibers between the main section of the solid section fibers and the main section of the hollow section fibers. These regions are integrated mesh structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollow ratio of 20% and a fiber diameter of 0.55 mm. The solid section fiber system forms a medium solid line with a fiber diameter of 0.42 mm, and the difference in fiber diameter is 0.13 mm, the total weight ratio of the medium solid section fiber is 38%, the apparent density is 0.054 g/cm ³ , and the surface is flat The thickness is 48mm.

The residual strain on the main section side of the hollow section fiber is 6.1%, the residual strain on the main section side of the solid section fiber is 12.1%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber 6.0 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 39.7N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 25.7N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 1.54. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 85.6N/φ100mm, and the hardness at 40% compression of the main section side of the solid section fiber when compressed is 52.1N/φ100mm, from the solid section fiber The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.64. The compressive deformation coefficient of the hollow cross-section fiber main area is 3.80, and the compressive deformation coefficient of the medium solid cross-section fiber main area is 7.72. The difference between the compressive deformation coefficients of the hollow cross-section fiber main zone side when pressurized is 3.92. The hysteresis loss when pressurized from the main fiber side of the hollow section is 25.9%, and the hysteresis loss when pressurized from the main fiber side of the solid section is 25.7%. The difference between the hysteresis loss when the profile fiber main area side is pressurized is 0.2 points. Table 1 shows the characteristics of the obtained mesh structure.

As shown in Table 1, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the middle solid section fiber main area side after 750N constant load repeated compression is less than 20% and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is 30% or less and the difference between them is 5 points or less. Because the value is small, the difference in compression durability on both sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, it imparts different cushioning properties on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Example I-3]

On the nozzle effective surface with a length of 50 cm in the width direction and a length of 57.2 mm in the thickness direction, the shape of the orifice is a triple bridge with an outer diameter of 3 mm and an inner diameter of 2.6 mm in the thickness direction from the first row to the seventh row The hollow forming orifices are arranged in a staggered arrangement with a spacing between the holes in the width direction of 6 mm and a spacing between the holes in the thickness direction of 5.2 mm, and the eighth to twelfth rows in the thickness direction are arranged with a solid-formed orifice with an outer diameter of 1 mm In a staggered arrangement with a pitch between holes in the width direction of 6 mm and a pitch between holes in the thickness direction of 5.2 mm, the polyester-based thermoplastic elastomer (A-1) obtained using the nozzle designed above was spun at the spinning temperature (melting temperature) At 240°C, the discharge rate of the single hole of the hollow hole is 1.8 g/min, and the discharge rate of the single hole of the solid hole is 1.1 g/min, and the cooling water is arranged below the nozzle surface 23 cm, and the width is 60 cm The stainless steel endless mesh is arranged in parallel with an opening width of 42mm so that a pair of pulling conveyor belt nets can be partially exposed on the water surface. On the conveyor belt net on the water surface, the molten state of the linear thread is twisted The ring is formed and a three-dimensional network structure is formed when the contact part is welded. While pulling the conveyor belt net between the two sides of the molten network structure, it is pulled into the cooling water at a pulling speed of 1.74m/min After the two surfaces in the thickness direction are flattened by curing, they are cut to a predetermined size and dried and heat-treated in hot air at 110°C for 15 minutes to obtain a mesh structure.

The obtained network structure system includes: the main area of the middle section fiber, which is mainly composed of the middle section fiber; the main section of the hollow section fiber, which is mainly composed of the hollow section fiber; and the mixed area, which is located in the middle section fiber The solid section fiber and the hollow section fiber are mixed between the main area and the hollow section fiber main area. These regions are integrated mesh structures without separation. The hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollowness of 23% and a fiber diameter of 0.81 mm. The solid section fiber system forms a medium-solid linear body with a fiber diameter of 0.56 mm, and the difference in fiber diameter is 0.25 mm, the total weight ratio of the medium solid section fiber is 30%, the apparent density is 0.044 g/cm ³ , and the surface is flat The thickness is 40mm.

The residual strain on the main section side of the hollow section fiber is 6.0%, the residual strain on the main section side of the solid section fiber is 4.9%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber 1.1 points. The hardness at the 25% compression of the main section of the hollow section fiber when compressed is 18.2N/φ100mm, and the hardness of the 25% compression at the main section of the solid section fiber when compressed is 17.7N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 1.03. The hardness at 40% compression when compressed from the main area side of the hollow section fiber is 37.6N/φ100mm, the hardness at 40% compression when compressed from the main area side of the solid section fiber is 34.9N/φ100mm, and the fiber from the medium section The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.08. The compressive deformation coefficient when pressurized from the main section side of the hollow section fiber is 5.31, and the compressive deformation coefficient when pressurized from the main section side of the solid section fiber is 5.59. The difference between the compressive deformation coefficient when the fiber is pressed from the main area of the solid cross section and the compressive deformation coefficient when the pressure is pressed from the side of the main fiber of the hollow cross section is 0.28 points. The hysteresis loss when the pressure is applied from the main fiber side of the hollow section is 25.7%, and the hysteresis loss when the pressure is applied from the main fiber side of the solid section is 27.1%. The difference in hysteresis loss during compression of the main fiber side of the profile fiber was 1.4 points. Table 1 shows the characteristics of the obtained mesh structure.

As shown in Table 1, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the middle solid section fiber main area side after 750N constant load repeated compression is less than 20% and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is 30% or less and the difference between them is 5 points or less. Because the value is small, the difference in compression durability on both sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, it imparts different cushioning properties on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Example I-4]

On the nozzle effective surface with a length of 50 cm in the width direction and a length of 67.6 mm in the thickness direction, the shape of the orifice is a triple bridge with an outer diameter of 3 mm and an inner diameter of 2.6 mm in the thickness direction from the first row to the seventh row The hollow forming orifices are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm, and the eighth to thirteenth rows in the thickness direction are formed with a solid outer diameter of 1.2 mm Arranged in a staggered arrangement with a pitch between holes in the width direction of 7 mm and a pitch between holes in the thickness direction of 6.1 mm, using the nozzles of the above design, and at a spinning temperature (melting temperature) of 240° C., the single hole discharge amount of the hollow holes is 1.1g/min, the single-hole discharge rate of the medium solid hole is 1.1g/min, and the nozzle is discharged below the nozzle surface. Cooling water is arranged below the nozzle surface of 28cm. A stainless steel ring net with a width of 60cm is paralleled at an interval of 52mm A pair of pull conveyor belt nets can be partially exposed on the water surface. On the conveyor belt net of the water surface, the molten state of the discharge thread is twisted to form a loop and a three-dimensional mesh is formed when the contact parts are welded. Structure, while pulling both sides of the molten mesh structure with a pulling conveyor belt net and pulling it into the cooling water at a pulling speed of 1.14m/min, by solidifying it, the two in the thickness direction After the surface is flattened, it is cut to a predetermined size and dried and heat-treated in hot air at 110°C for 15 minutes, thereby obtaining a mesh structure.

The obtained network structure system includes: the main area of the middle section fiber, mainly composed of the middle section fiber; the main section of the hollow section fiber, mainly composed of the hollow section fiber; the mixed area, which is mainly located in the middle section fiber The solid section fiber and the hollow section fiber are mixed between the region and the main section of the hollow section fiber. These regions are integrated mesh structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball-shaped cross section, and a hollow linear body with a hollow ratio of 18% and a fiber diameter of 0.67 mm. The solid section fiber system forms a medium-solid linear body with a fiber diameter of 0.60 mm, and the difference in fiber diameter is 0.07 mm, the total weight ratio of the medium solid section fiber is 47%, the apparent density is 0.044 g/cm ³ , and the surface is flat The thickness is 50mm.

The residual strain on the main section side of the hollow section fiber is 6.6%, the residual strain on the main section side of the solid section fiber is 7.0%, and the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber 0.4 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 41.2N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 37.3N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression at the time of compression in the main region side to the hardness at 25% compression at the time of compression at the main region side of the hollow cross-section fiber is 1.10. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 69.0N/φ100mm, and the hardness of 40% compression at the main section side of the solid section fiber when compressed is 65.5N/φ100mm. The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.05. The compressive deformation coefficient when the fiber is pressed from the main area side of the hollow section fiber is 4.51, and the compressive deformation coefficient when the pressure is pressed from the main area side of the fiber of the solid section is 4.74. The difference between the compressive deformation coefficient of the fiber in the main area of the solid section and the compressive deformation coefficient of the fiber in the area of the hollow section is 0.23. The hysteresis loss when pressurized from the main fiber side of the hollow section is 23.1%, and the hysteresis loss when pressurized from the main fiber side of the solid section is 23.5%. The difference in hysteresis loss during compression of the main fiber side of the profile fiber was 0.4 points. Table 1 shows the characteristics of the obtained mesh structure.

As shown in Table 1, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the middle solid section fiber main area side after 750N constant load repeated compression is less than 20% and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is 30% or less and the difference between them is 5 points or less. Because the value is small, the difference in compression durability on both sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, different cushioning properties are provided on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Comparative Example I-R1]

Using the obtained polyester-based thermoplastic elastomer (A-1), at a spinning temperature (melting temperature) of 240°C, a nozzle designed as follows: a length in the width direction of 50 cm and a length in the thickness direction of 67.6 mm The shape of the orifice on the effective surface of the nozzle is that the hollow forming orifices of the triple bridge are arranged in the first row to the eighth row with an outer diameter of 3 mm and an inner diameter of 2.6 mm, so that the widthwise hole spacing is 10 mm, and the thickness direction hole is The staggered arrangement of the pitch is 7.5mm, and in the 9th to 11th rows, the openings are formed with a medium solid outer diameter of 0.7mm to form a widthwise hole spacing of 2.5mm, a thickness direction hole spacing of 3.7mm, with a hollow The single-hole discharge volume of the hole is 2.0g/min, the single-hole discharge volume of the medium solid hole is 0.5g/min, and the total discharge volume is 1100g/min. The speed is discharged below the nozzle. The cooling water is arranged below the nozzle surface 18cm. A stainless steel ring net with a width of 60 cm is arranged in parallel with an opening width of 50 mm so that a pair of pull conveyor belt nets can be partially exposed on the water surface, and the melted state is discharged linearly on the conveyor belt net on the water surface Twist to form a ring and form a three-dimensional network structure when the contact parts are fused. While pulling both sides of the molten network structure with a pulling conveyor belt net, pull in at a pulling speed of 1.00m/min to It is cooled in water, cured, cut into a predetermined size, and dried and heat-treated in hot air at 110°C for 15 minutes, thereby obtaining a network structure.

The obtained mesh structure system has the main area of the middle section fiber mainly composed of the middle section fiber and the main section of the hollow section fiber mainly composed of the hollow section fiber, and these regions are not separated but become one Incorporated mesh structure. Since the obtained mesh-like structure has a very wide gap between the holes in the hollow cross-section fiber forming openings and a width between the solid cross-section fiber forming openings, it is between the loops of the solid cross-section fibers and the loops The loop of the hollow cross-section fiber cannot be penetrated, and a mesh structure in which there is no area where the solid cross-section fiber and the hollow cross-section fiber are mixed to form a thickness is formed.

The hollow section fiber system forms a hollow section with a triangular rice ball shape and a hollow ratio of 28% and a fiber diameter of 0.80 mm, while the hollow section fiber system forms a hollow linear body with a fiber diameter of 0.32 mm , And the difference in fiber diameter is 0.48 mm, the proportion of the total weight of the medium-solid cross-section fibers is 27%, the apparent density is 0.046 g/cm ³ , and the surface flattening thickness is 50 mm.

The residual strain on the main section side of the hollow section fiber is 5.3%, the residual strain on the main section side of the solid section fiber is 15.6%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber It was 10.3 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 22.7N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 21.9N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 1.04. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 41.1N/φ100mm, and the hardness at 40% compression of the main section side of the solid section fiber when compressed is 40.3N/φ100mm. The ratio of the hardness at 40% compression when the main area of the dimension is compressed to the hardness at 40% compression when the main area of the hollow cross-section fiber is compressed is 1.02. The compressive deformation coefficient at the time of compression from the main fiber side of the hollow cross section is 3.80, the compressive deformation coefficient at the pressure of the main fiber side at the solid cross section is 3.62, and the compressive deformation factor at the pressure of the main fiber side of the solid cross section is The difference in compressive deformation coefficient of the hollow section fiber at the main region side when pressed is 0.18. The hysteresis loss when pressurized from the main fiber side of the hollow section is 23.1%, the hysteresis loss when pressurized from the main fiber side of the solid section is 23.8%. The difference in hysteresis loss when the side of the cross-section fiber is pressurized is 0.7 points. Table 1 shows the characteristics of the obtained mesh structure.

As shown in Table 1, in the net-like structure obtained in this comparative example, the difference in residual strain after repeated compression of 750N constant load on the main section side of the hollow section fiber and the main section side of the middle solid section fiber was greater than 10 points. Therefore, the difference in compression durability between the two sides is also large. That is, the mesh structure obtained in this comparative example does not satisfy the requirements of the present invention, and it is a mesh structure having a large difference in compression durability between the two surfaces.

[Comparative Example I-R2]

Use a nozzle designed as follows: on the effective surface of the nozzle with a length of 1000 mm in the width direction and a length of 31.2 mm in the thickness direction, the shape of the orifice is 7 rows in the thickness direction with an outer diameter of 3 mm and an inner diameter of 2.6 mm. The orifices of the hollow bridge forming a cross section of the triple bridge are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm, and the obtained polyester-based thermoplastic elastomer (A-1) is spun At a temperature (melting temperature) of 240°C, the single-hole discharge rate is 1.5g/min, and the nozzle is discharged below the nozzle surface, 28cm below the nozzle surface, cooling water is arranged, and a stainless steel ring net with a width of 2000mm is parallel at an opening width of 27mm A pair of pulling conveyor belt nets can be arranged so as to partially expose the water surface. On the conveyor belt net on the water surface, the spitting thread in the molten state is twisted to form a loop and form three-dimensional when the contact parts are welded The mesh structure is drawn into the cooling water at a pulling speed of 1.14m/min while sandwiching both sides of the molten mesh structure with a pulling conveyor belt net, and by curing it, the two After the surfaces were flattened, they were cut to a predetermined size and dried and heat-treated in hot air at 110°C for 15 minutes, thereby obtaining a net-shaped structure mainly composed of hollow cross-sectional fibers having a triangular rice ball shape in cross-sectional shape. The apparent density of the obtained network structure was 0.063 g/cm ³ , the surface flattening thickness was 25 mm, the hollow section fiber hollowness was 20%, and the fiber diameter was 0.76 mm.

In addition, a nozzle of the following design is used: the effective surface of the nozzle with a width of 1000 mm and a width of 31.2 mm in the thickness direction, the shape of the orifice is arranged in 7 rows in the thickness direction with an orifice with a solid diameter of 1 mm. The staggered arrangement between the holes in the width direction is 6 mm and the distance between the holes in the thickness direction is 5.2 mm, and the obtained polyester-based thermoplastic elastomer (A-1) is discharged as a single hole at a spinning temperature (melting temperature) of 240°C The amount of 0.9g/min is discharged below the nozzle. Cooling water is arranged below the nozzle surface 28cm. A pair of stainless steel ring nets with a width of 2000mm are paralleled at an opening width of 27mm to partially expose a pair of pull conveyor belt nets to the water surface It is arranged in the above way. On the conveyor belt net on the water surface, the spitted linear thread is twisted to form a loop and a three-dimensional mesh structure is formed when the contact part is welded, while being pulled by the conveyor belt net. The two sides of the molten mesh structure are drawn into cooling water at a pulling speed of 1.14 m/min. After solidification, the two surfaces in the thickness direction are flattened, and then cut to a predetermined size. Drying and heat treatment in hot air at 110°C for 15 minutes, thereby obtaining a network structure mainly composed of fibers with a medium cross section. The apparent density of the obtained network structure was 0.038 g/cm ³ , the surface flattening thickness was 25 mm, and the fiber diameter of the medium-solid cross-section fiber was 0.50 mm.

The obtained net-shaped structure mainly composed of solid cross-section fibers and the net-shaped structure mainly composed of hollow cross-section fibers are superposed to produce a net-shaped structure. The apparent density of the entire laminated network structure is 0.051 g/cm ³ and the thickness is 50 mm. In addition, the difference between the fiber diameter of the hollow cross-section fiber and the fiber diameter of the solid cross-section fiber was 0.26 mm.

The superimposed mesh structure has a residual strain of 6.3% on the main section side of the hollow section fiber, a 17.3% residual strain on the main section side of the middle section fiber, and the residual strain on the main section side of the middle section section fiber and the hollow section fiber The difference in residual strain on the main area side was 11.0 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 45.1N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 32.1N/φ100mm, from the solid section fiber Main area The ratio of the hardness at 25% compression when compressed on the side and the hardness at 25% compression when compressed from the main region side of the hollow cross-section fiber is 1.40. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 75.1N/φ100mm, and the hardness of 40% compression at the main section side of the solid section fiber when compressed is 61.3N/φ100mm, from the solid section fiber The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.23. The compressive deformation coefficient of the hollow cross-section fiber main area when compressed is 4.07, the compressive deformation coefficient of the medium solid cross-section fiber main area is 5.99, and the compressive deformation coefficient of the medium solid cross-section fiber main area is The difference in compressive deformation coefficient of the hollow section fiber at the main region side under pressure is 1.92 points. The hysteresis loss when the pressure is applied from the main fiber side of the hollow section is 23.7%, the hysteresis loss when the pressure is applied from the main fiber side of the solid section is 26.2%, the hysteresis loss when the pressure is applied from the main fiber side of the solid section and the hollow The difference in hysteresis loss during compression of the main area of the cross-sectional fiber is 2.5 points. Table 1 shows the characteristics of the obtained mesh structure.

As shown in Table 1, in the net-like structure obtained in this comparative example, the difference in residual strain after repeated compression of 750N constant load on the main section side of the hollow section fiber and the main section side of the middle solid section fiber was greater than 10 points. Therefore, the difference in compression durability between the two sides is also large. That is, the mesh structure obtained in this comparative example does not satisfy the requirements of the present invention, and it is a mesh structure having a large difference in compression durability between the two surfaces.

[Table 1]

[Example II-1]

Use a nozzle of the following design: on the effective surface of the nozzle with a length of 50 cm in the width direction and a length of 67.6 mm in the thickness direction, the shape of the orifice is 3 mm in diameter in the thickness direction from the first row to the seventh row, The inner diameter of the triple bridge is 2.6mm. The holes of the triple bridge are arranged in a staggered arrangement of 6mm in the width direction and 5.2mm in the thickness direction. The 8th to 14th rows in the thickness direction are 1mm in outer diameter The orifices of the medium solid formation are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm, and the polyolefin-based thermoplastic elastomer (B-1) is made of ethylene‧α-olefin ( ethylene‧α-olefin) multi-block copolymer INFUSE D9530.05 (made by The Dow Chemical Company) 100% by weight, at a spinning temperature (melting temperature) of 240°C, the single-hole discharge amount of the hollow hole is 1.8g/min, the single-hole discharge rate of the medium-solid hole is 1.1g/min, and the cooling water is arranged below the nozzle surface 30cm, and the stainless steel ring net with a width of 60cm is parallel to the opening width of 50mm A pair of pull conveyor belt nets can be partially exposed on the water surface. On the conveyor belt net of the water surface, the molten state of the discharge thread is twisted to form a loop and a three-dimensional mesh is formed when the contact parts are welded. Structure, while pulling both sides of the molten mesh structure with a pulling conveyor belt net and pulling into the cooling water at a pulling speed of 1.43m/min, by solidifying it, the two in the thickness direction After the surface is flattened, it is cut to a predetermined size and dried and heat-treated in hot air at 70°C for 15 minutes, thereby obtaining a mesh structure.

The obtained network structure system includes: the main area of the middle section fiber, mainly composed of the middle section fiber; the main section of the hollow section fiber, mainly composed of the hollow section fiber; and the mixed area, which is located in the middle section fiber The solid section fiber and the hollow section fiber are mixed between the main area and the hollow section fiber main area. These areas are integrated network structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollowness ratio of 30% and a fiber diameter of 1.13 mm. The solid-section fiber system forms a medium-solid linear body with a fiber diameter of 0.52 mm, and the difference in fiber diameter is 0.61 mm, the total weight ratio of the medium-solid section fiber is 37%, the apparent density is 0.043 g/cm ³ , the surface The flattened thickness is 45mm.

The residual strain on the main section side of the hollow section fiber is 11.4%, the residual strain on the main section side of the solid section fiber is 13.5%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber It was 2.1 points. The hardness at 25% compression when the main section side of the hollow section fiber is compressed is 11.0N/φ100mm, and the hardness at 25% compression when the main section side of the solid section fiber is compressed is 6.2N/φ100mm, and the fiber from the medium section The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 1.77. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 22.2N/φ100mm, and the hardness at 40% compression of the main section side of the solid section fiber when compressed is 19.1N/φ100mm, from the solid section fiber The hardness at 40% compression when the main area is compressed and the hollow profile fiber The ratio of the hardness at the time of 40% compression in the main area of the dimension is 1.16. The compressive deformation coefficient of the hollow cross-section fiber main area side is 4.63, the compressive deformation coefficient of the medium solid cross-section fiber main area side is 7.59, and the compressive deformation coefficient of the medium solid cross-section fiber main area side is The difference between the compression deformation coefficient of the hollow section fiber at the main region side under pressure is 2.96. The hysteresis loss when pressurized from the main fiber side of the hollow section is 42.6%, and the hysteresis loss when pressurized from the main fiber side of the solid section is 44.8%. The difference in hysteresis loss when the side of the cross-section fiber is pressurized is 2.2 points. Table 2 shows the characteristics of the obtained mesh structure.

As shown in Table 2, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the medium solid section fiber main area side after 750N constant load repeated compression is 20% or less and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is Below 60% and the difference between them is less than 5 points. Because of these small values, the difference in compression durability between the two sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, different cushioning properties are provided on both sides. That is, the mesh structure system obtained in this embodiment Satisfying the requirements of the present invention is a mesh structure having a small difference in compressive durability between the two surfaces and imparting different cushioning properties on the two surfaces.

[Example II-2]

A net-like structure was obtained in the same manner as in Example II-1 except that cooling water was arranged below the nozzle surface 38 cm. The obtained network structure system includes: the main area of the middle section fiber, which is mainly composed of the middle section fiber; the main section of the hollow section fiber, which is mainly composed of the hollow section fiber; and the mixed area, which is located in the middle section fiber The solid section fiber and the hollow section fiber are mixed between the main area and the hollow section fiber main area. These regions are integrated mesh structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollow ratio of 28% and a fiber diameter of 1.00 mm. The solid-section fiber system forms a medium-solid linear body with a fiber diameter of 0.47 mm, and the difference in fiber diameter is 0.53 mm, the total weight ratio of the medium-solid section fiber is 37%, the apparent density is 0.045 g/cm ³ , the surface The flattened thickness is 43mm.

The residual strain on the main section side of the hollow section fiber is 11.6%, the residual strain on the main section side of the solid section fiber is 13.0%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber It is 1.4 points. The hardness at the 25% compression of the main section of the hollow cross-section fiber when compressed is 15.3N/φ100mm, and the hardness of the 25% compression at the compression of the main section side of the solid section fiber is 9.7N/φ100mm, from The ratio of the hardness at 25% compression when the main section of the solid section fiber is compressed to the hardness at 25% compression when the main section side of the hollow section fiber is compressed is 1.58. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 28.5N/φ100mm, and the hardness of 40% compression at the main section side of the solid section fiber when compressed is 23.7N/φ100mm, from the solid section fiber The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.20. The compressive deformation coefficient of the hollow cross-section fiber main area when compressed is 4.29, the compressive deformation coefficient of the medium solid cross-section fiber main area when compressed is 6.30, and the compressive deformation coefficient of the medium solid cross section fiber main area when compressed is from The difference in compressive deformation coefficient of the hollow section fiber at the main region side when pressed is 2.01. The hysteresis loss when pressurized from the main fiber side of the hollow section is 42.5%, and the hysteresis loss when pressurized from the main fiber side of the solid section is 46.2%. The difference in hysteresis loss when the side of the cross-section fiber is pressurized is 3.7 points. Table 2 shows the characteristics of the obtained mesh structure.

As shown in Table 2, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the medium solid section fiber main area side after 750N constant load repeated compression is 20% or less and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is 60% or less and the difference is less than 5 points, because the value is small, the two The difference in surface compression durability is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, it imparts different cushioning properties on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Example II-3]

Use a nozzle of the following design: on the effective surface of the nozzle with a length of 50 cm in the width direction and a length of 67.6 mm in the thickness direction, the shape of the orifice is 3 mm in diameter in the thickness direction from the first row to the seventh row, The inner diameter of the triple bridge is 2.6mm. The holes of the triple bridge are arranged in a staggered arrangement of 6mm in the width direction and 5.2mm in the thickness direction. The 8th to 14th rows in the thickness direction are 1mm in outer diameter The orifices of the medium solid formation are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm, and the obtained polyolefin-based thermoplastic elastomer is composed of ethylene‧α-olefin Multi-block copolymer INFUSE D9530.05 (manufactured by The Dow Chemical Company) 100% by weight, at a spinning temperature (melting temperature) of 240°C, the single-hole discharge volume of the hollow hole is 1.8 g/min, and the solid hole The single-hole discharge rate is 1.1g/min, and the nozzle is discharged below the nozzle surface. Cooling water is arranged below the nozzle surface 30cm. A stainless steel ring net with a width of 60cm is paralleled at an interval of 40mm in opening. The pulling conveyor belt net can be partially exposed on the water surface. On the conveyor belt net on the water surface, the molten state of the discharge thread is twisted to form a loop and a three-dimensional network structure is formed when the contact part is welded. , While pulling both sides of the molten mesh structure with a pulling conveyor belt net and pulling into the cooling water at a pulling speed of 1.84m/min, by solidifying it, the two surfaces in the thickness direction are flattened After chemical conversion, it was cut to a predetermined size and dried and heat-treated in hot air at 70°C for 15 minutes, thereby obtaining a mesh structure.

The obtained network structure system includes: the main area of the middle section fiber, mainly composed of the middle section fiber; the main section of the hollow section fiber, mainly composed of the hollow section fiber; and the mixed area, located in the main section fiber The solid section fiber and the hollow section fiber are mixed between the region and the main section of the hollow section fiber. These regions are integrated mesh structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollow ratio of 29% and a fiber diameter of 1.14 mm. The solid-section fiber system forms a medium-solid linear body with a fiber diameter of 0.57 mm, and the difference in fiber diameter is 0.57 mm, the total weight ratio of the medium-solid fiber is 37%, the apparent density is 0.052 g/cm ³ , and the surface The flattened thickness is 32mm.

The residual strain on the main section side of the hollow section fiber is 12.2%, the residual strain on the main section side of the solid section fiber is 13.9%, the difference between the residual strain on the main section side of the hollow section fiber and the residual strain on the main section side of the hollow section fiber 1.7 points. When pressurizing from the main fiber side of the hollow section The hardness at 25% compression is 7.7N/φ100mm, the hardness at 25% compression when compressed from the main area side of the solid section fiber is 6.5N/φ100mm, 25% compression when compressed from the main area side of the medium section fiber The ratio of the hardness at the time to the hardness at 25% compression when compressed from the main region side of the hollow cross-section fiber is 1.18. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 19.3N/φ100mm, and the hardness at 40% compression of the main section side of the solid section fiber when compressed is 16.8N/φ100mm, from the solid section fiber The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.15. The compressive deformation coefficient when the hollow fiber section is pressurized from the main region side is 9.44, and the compressive deformation coefficient when the solid section fiber is pressurized from the main region side is 9.61. The difference in compressive deformation coefficient of the hollow section fiber at the main region side when pressed is 0.17 points. The hysteresis loss when pressurized from the main fiber side of the hollow section is 43.4%, and the hysteresis loss when pressurized from the main fiber side of the solid section is 47.2%. The difference in hysteresis loss during compression of the main area of the profile fiber was 3.8 points. Table 2 shows the characteristics of the obtained mesh structure.

As shown in Table 2, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the medium solid section fiber main area side after 750N constant load repeated compression is 20% or less and the difference The value is 10 points or less, the difference between the compression deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hollow section fiber The hysteresis loss on the main area side of the dimension and the main area side of the fiber of the mid-solid section is 60% or less and the difference between them is 5 points or less. Since the value is small, the difference in compression durability on both sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, it imparts different cushioning properties on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Example II-4]

Use a nozzle of the following design: on the effective surface of the nozzle with a length of 50 cm in the width direction and a length of 77.9 mm in the thickness direction, the shape of the orifice is 3 mm in the thickness direction from the first row to the tenth row. The inner diameter of the triple bridge is 2.6mm. The holes of the triple bridge are arranged in a staggered arrangement of 6mm in the width direction and 5.2mm in the thickness direction. The 11th to 16th rows in the thickness direction are 1mm in outer diameter The orifices of the medium solid formation are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm, and the obtained polyolefin-based thermoplastic elastomer (B-2) is made of ethylene‧α - olefin random block copolymer composed of DOWLEX ^TM 2035G (Dow Chemical company, Ltd.) 100 wt%, at 230 deg.] C, at a single hole discharge amount of the hollow hole at a spinning temperature (melting temperature) of 1.3g / min The single-hole discharge volume of the medium-solid hole is 0.8g/min, and the cooling water is arranged below the nozzle surface 32cm. A pair of stainless steel ring nets with a width of 60cm are drawn in parallel at an interval of 60mm in width. The conveyor belt net can be arranged in such a way that the surface of the water can be partially exposed. On the conveyor belt net of the water, the spitting thread in the molten state is twisted to form a loop and a three-dimensional mesh structure is formed when the contact part is welded. The two sides of the molten mesh structure are sandwiched by a pulling conveyor belt net into the cooling water at a pulling speed of 1.54 m/min, and the two surfaces in the thickness direction are flattened by solidification , Cut it into a predetermined size and dry heat treatment at 70 ℃ hot air for 15 minutes to obtain a mesh structure.

The obtained network structure system includes: the main area of the middle section fiber, which is mainly composed of the middle section fiber; the main section of the hollow section fiber, which is mainly composed of the hollow section fiber; and the mixed area, which is located in the middle section fiber The solid section fiber and the hollow section fiber are mixed between the main area and the hollow section fiber main area. These regions are integrated mesh structures without separation, and the hollow section fiber system forms a hollow section with a triangular rice ball shape in cross section, and a hollow linear body with a hollowness of 33% and a fiber diameter of 0.88 mm. The solid section fiber system forms a medium solid linear body with a fiber diameter of 0.49 mm, and the difference in fiber diameter is 0.39 mm, the total weight ratio of the medium solid section fiber is 38%, the apparent density is 0.032 g/cm ³ , the surface The flattened thickness is 56mm.

The residual strain on the main section side of the hollow section fiber is 15.1%, and the residual strain on the main section side of the solid section fiber is 15.5%. The difference between the residual strain on the side of the main region and the residual strain on the side of the main section of the hollow-section fiber is 0.4 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 23.0N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 17.0N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 1.35. The hardness at 40% compression of the main section side of the hollow section fiber when compressed is 40.4N/φ100mm, and the hardness at 40% compression of the main section side of the solid section fiber when compressed is 36.3N/φ100mm, from the solid section fiber The ratio of the hardness at 40% compression when the main region side is compressed to the hardness at 40% compression when the main region side of the hollow cross-section fiber is compressed is 1.11. The compression deformation coefficient when the fiber is pressed from the main section of the hollow cross section is 3.50, and the compression deformation coefficient when the pressure is from the main section of the solid section fiber is 5.01. The difference in compressive deformation coefficient of the hollow section fiber at the main region side when pressed is 1.51. The hysteresis loss when the pressure is applied from the main fiber side of the hollow section is 39.7%, and the hysteresis loss when the pressure is applied from the main fiber side of the solid section is 43.6%. The difference in hysteresis loss during compression of the main area of the profile fiber was 3.9 points. Table 2 shows the characteristics of the obtained mesh structure.

As shown in Table 2, in the mesh structure obtained in this example, the residual strain of the hollow section fiber main area side and the medium solid section fiber main area side after 750N constant load repeated compression is 20% or less and the difference Value is 10 points or less, the difference between the compressive deformation coefficient of the hollow section fiber main area side and the solid section fiber main area side is 5 or less, and the hysteresis loss of the hollow section fiber main area side and the solid section fiber main area side is 60% The difference between the following and these values is 5 points or less, and since the value is small, the difference in compression durability on both sides is also small. In addition, in the mesh structure obtained in this example, the ratio of the hardness of the hollow section fiber main region side to the solid section fiber main region side at 25% compression is 1.03 or more, and the hollow section fiber main region side and the solid section The ratio of the hardness at 40% compression of the main fiber side of the cross-section fiber is 1.05 or more. Since this value is large, it imparts different cushioning properties on both sides. That is, the mesh structure system obtained in this example satisfies the requirements of the present invention, which is an excellent mesh structure having a small difference in compression durability on both sides and imparting different cushioning properties on both sides.

[Comparative Example II-R1]

Use a nozzle designed as follows: On the effective surface of the nozzle with a length of 50 cm in the width direction and a length of 31.2 mm in the thickness direction, the shape of the orifice is 7 rows in the thickness direction with an outer diameter of 3 mm and an inner diameter of 2.6 mm. The orifices of the hollow bridge, which is a hollow formable cross section of the triple bridge, are arranged in a staggered arrangement with a spacing between holes in the width direction of 6 mm and a spacing between holes in the thickness direction of 5.2 mm. The multi-block copolymer INFUSE D9530.05 (manufactured by Dow Chemical Company), 100% by weight, is discharged below the nozzle at a spinning temperature (melting temperature) of 240°C at a rate of 1.8 g/min per hole discharge , The cooling water is arranged below the nozzle surface 38cm, and the stainless steel ring net with a width of 60cm is arranged in parallel with an opening width of 30mm so that a pair of drawing conveyor belt nets can be partially exposed on the water surface, and the conveyor belt on the water surface On the wire, twist the discharged thread in a molten state to form a loop and form a three-dimensional network structure when the contact portion is welded. While pulling on both sides of the molten network structure with a pulling conveyor belt net, The pulling speed of 1.43m/min is drawn into the cooling water, and the two surfaces in the thickness direction are flattened by solidification, then cut to a predetermined size and dried in 70°C hot air for 15 minutes to obtain heat The cross-sectional shape is a triangular rice ball-shaped network structure mainly composed of hollow cross-sectional fibers. The apparent density of the obtained network structure was 0.048 g/cm ³ , the surface flattening thickness was 25 mm, the hollow section fiber hollowness was 30%, and the fiber diameter was 1.00 mm.

In addition, the following design of the nozzle is used: the effective surface of the nozzle with a width of 50 cm in the width direction and a width of 31.2 mm in the thickness direction, the shape of the orifice is arranged in 7 rows in the thickness direction with a medium solid orifice with an outer diameter of 1 mm The staggered arrangement between the holes in the width direction is 6 mm and the distance between the holes in the thickness direction is 5.2 mm, and the multi-block copolymer INFUSE D9530.05 composed of ethylene and α-olefin is used as a polyolefin-based thermoplastic elastomer. 100% by weight, at a spinning temperature (melting temperature) of 240°C, the single-hole discharge rate is 1.1g/min, and the nozzle is discharged below the nozzle surface. The cooling water is arranged below the nozzle surface 38cm, and the width is 60cm The stainless steel endless mesh is arranged in parallel with an opening width of 25mm so that a pair of pulling conveyor belt nets can be partially exposed on the water surface. On the conveyor belt net on the water surface, the molten state of the discharged linear twist is twisted While forming a ring and forming a three-dimensional network structure when the contact parts are fused, the two sides of the molten network structure are sandwiched between the two sides of the molten state by the pulling conveyor belt net, and pulled into the cooling water at a pulling speed of 1.43m/min After curing and flattening the two surfaces in the thickness direction, it is cut to a predetermined size and dried and heat-treated in hot air at 70°C for 15 minutes to obtain a net-shaped structure mainly composed of medium-solid cross-section fibers. The apparent density of the obtained network structure was 0.037 g/cm ³ , the surface flattening thickness was 20 mm, and the fiber diameter of the medium-solid cross-section fiber was 0.45 mm.

The obtained net-shaped structure mainly composed of solid cross-section fibers and the net-shaped structure mainly composed of hollow cross-section fibers are superposed to produce a net-shaped structure. The apparent density of the entire laminated network structure is 0.043 g/cm ³ and the thickness is 45 mm. In addition, the difference between the fiber diameter of the hollow cross-section fiber and the fiber diameter of the solid cross-section fiber was 0.55 mm.

The superimposed mesh structure has a residual strain of 11.2% on the main section side of the hollow section fiber, a residual strain of 28.5% on the main section side of the middle section fiber, and a residual strain on the main section side of the middle section section fiber and the hollow section fiber The difference in residual strain on the main area side was 17.3 points. The hardness at 25% compression of the main section side of the hollow section fiber when compressed is 8.8N/φ100mm, and the hardness of 25% compression at the main section side of the solid section fiber when compressed is 4.4N/φ100mm, from the solid section fiber The ratio of the hardness at 25% compression when the main region side is compressed to the hardness at 25% compression when the main region side of the hollow cross-section fiber is compressed is 2.00. The hardness at 40% compression when compressed from the main area side of the hollow section fiber is: 20.8N/φ100mm, the hardness at 40% compression when compressed from the main area side of the solid section fiber is 13.4N/φ100mm, the hardness at 40% compression when compressed from the main area side of the medium section fiber and the hollow section fiber The ratio of the hardness at 40% compression at the time of compression in the main area is 1.55. The compression deformation coefficient at the time of compression from the main section side of the hollow section fiber is 7.87, the compression deformation coefficient at the compression of the main section side of the solid section fiber is 11.8. The difference in compressive deformation coefficient of the hollow section fiber at the main region side under pressure is 3.93 points. The hysteresis loss when pressurized from the main fiber side of the hollow section is 47.4%, and the hysteresis loss when pressurized from the main fiber side of the solid section is 48.1%. The difference in hysteresis loss when the side of the cross-section fiber is pressurized is 0.7 points. Table 2 shows the characteristics of the obtained mesh structure.

As shown in Table 2, in the mesh structure obtained in this comparative example, among the residual strain after repeated compression of 750 N constant load on the hollow section fiber main region side and the middle solid section fiber main region side, the middle solid section fiber main region side , Is greater than 20%, and the difference is greater than 10 points, so the difference in compression durability on both sides is also large. That is, the mesh structure obtained in this comparative example does not satisfy the requirements of the present invention, and it is a mesh structure having a large difference in compression durability between the two surfaces.

[Table 2]

All the embodiments and the contents of the embodiments disclosed herein are examples and should not be used to limit. The scope of the present invention is disclosed by the scope of the patent application rather than the above description, and includes all changes equivalent to the scope of the patent application and within the scope thereof.

[Industry availability]

The mesh structure system of the present invention is aimed at the conventional mesh structure between each other or between the mesh structure and the hard cotton and mesh without losing the comfort or breathability of the mesh structure when sitting in the past. The following problems of composite molded products formed by structures and urethane are improved: no matter from which side you start to use, the compression durability when you use the other side will be different, or the manufacturing cost is high, and the use of adhesion When the agent is applied, the hardness changes due to the amount of coating, and a foreign body sensation or recycling becomes complicated. Therefore, the mesh structure of the present invention has high added value due to the different cushioning properties on both sides, and can provide bedding suitable for office chairs, furniture, sofas, beds, etc., or trains, automobiles, two-wheelers, strollers, and children's chairs. , A mesh structure of a cushioning material such as a seat for a vehicle such as a wheelchair, a floor mat, or an impact absorption mat such as an anti-collision or anti-pinch member, which has made a great contribution to the industry.

Claims (10)

A mesh structure having a continuous linear shape of any one of a continuous linear body of a polyester-based thermoplastic elastomer having a fiber diameter of 0.1 mm or more and 3.0 mm or less and a continuous linear body of a polyolefin-based thermoplastic elastomer The three-dimensional random ring joint structure composed of the body; exists in the thickness direction of the aforementioned mesh structure: the main area of the solid section fiber is composed of the fiber mainly having the solid section; the main area of the hollow section fiber is mainly composed of the hollow A cross-section of the fiber; and a mixed region, which is formed by mixing the fiber with the solid cross-section and the fiber with the hollow cross-section between the main area of the solid cross-section fiber and the main area of the hollow cross-section fiber; 750N constant load of the middle solid section fiber main region side of the reticulated structure after repeated compression The residual strain of the middle solid section fiber main region side after repeated compression and the 750N constant load of the hollow section fiber main region side pressure After repeated compression, any residual strain on the main section side of the hollow section fiber is 20% or less; the difference between the residual strain on the main section side of the solid section fiber and the residual strain on the main section side of the hollow section fiber is 10 points the following. The mesh structure according to claim 1, wherein the apparent density is 0.005 g/cm ³ or more and 0.20 g/cm ³ or less. The mesh structure according to claim 1 or 2, wherein the fiber having a hollow cross-section has a thicker fiber diameter than the fiber having a solid cross-section, and the fiber having a solid cross-section The difference in fiber diameter of fibers having a hollow cross section is 0.07 mm or more. The mesh structure as described in claim 1 or 2, wherein the hardness at the time of compression of 25% from the side of the main section of the fiber of the solid section and the compression of 25% at the side of the fiber of the main section of the hollow section The ratio of hardness at that time is 1.03 or more. The mesh structure according to claim 1 or 2, wherein the hardness at the time of 40% compression when compressed from the main region side of the solid section fiber and the 40% compression when compressed from the main region side of the hollow section fiber The ratio of hardness at that time is 1.05 or more. The mesh structure according to claim 1 or 2, wherein the difference between the compressive deformation coefficient when pressurized from the side of the main fiber region of the solid section and the compressive deformation coefficient when pressurized from the side of the main fiber region of the hollow section 5 or less. The mesh structure as described in claim 1 or 2, wherein the difference between the hysteresis loss when pressurized from the main region side of the fiber of the solid section and the hysteresis loss when pressurized from the main region side of the fiber of the hollow section is 5 Points below. The mesh structure according to claim 1 or 2, wherein the continuous linear body of the thermoplastic elastomer is a continuous linear body of the polyester-based thermoplastic elastomer; when pressurized from the side of the main region of the fiber of the middle solid section And any of the hysteresis loss when pressurized from the main region side of the hollow cross-section fiber is 30% or less. The mesh structure according to claim 1 or 2, wherein the continuous linear body of the thermoplastic elastomer is a continuous linear body of the polyolefin-based thermoplastic elastomer; Both of the hysteresis loss when pressurized from the main region side of the solid section fiber and when pressed from the main region side of the hollow section fiber are 60% or less. A cushioning material including a mesh structure described in any one of claims 1 to 9 inside a cushion, and can be used in both directions.

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